CVE-2024-26656

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-26656", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.145Z", "datePublished": "2024-04-02T06:08:43.558Z", "dateUpdated": "2026-08-05T11:26:34.438Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:26:34.438Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix use-after-free bug\n\nThe bug can be triggered by sending a single amdgpu_gem_userptr_ioctl\nto the AMDGPU DRM driver on any ASICs with an invalid address and size.\nThe bug was reported by Joonkyo Jung <joonkyoj@yonsei.ac.kr>.\nFor example the following code:\n\nstatic void Syzkaller1(int fd)\n{\n\tstruct drm_amdgpu_gem_userptr arg;\n\tint ret;\n\n\targ.addr = 0xffffffffffff0000;\n\targ.size = 0x80000000; /*2 Gb*/\n\targ.flags = 0x7;\n\tret = drmIoctl(fd, 0xc1186451/*amdgpu_gem_userptr_ioctl*/, &arg);\n}\n\nDue to the address and size are not valid there is a failure in\namdgpu_hmm_register->mmu_interval_notifier_insert->__mmu_interval_notifier_insert->\ncheck_shl_overflow, but we even the amdgpu_hmm_register failure we still call\namdgpu_hmm_unregister into amdgpu_gem_object_free which causes access to a bad address.\nThe following stack is below when the issue is reproduced when Kazan is enabled:\n\n[ +0.000014] Hardware name: ASUS System Product Name/ROG STRIX B550-F GAMING (WI-FI), BIOS 1401 12/03/2020\n[ +0.000009] RIP: 0010:mmu_interval_notifier_remove+0x327/0x340\n[ +0.000017] Code: ff ff 49 89 44 24 08 48 b8 00 01 00 00 00 00 ad de 4c 89 f7 49 89 47 40 48 83 c0 22 49 89 47 48 e8 ce d1 2d 01 e9 32 ff ff ff <0f> 0b e9 16 ff ff ff 4c 89 ef e8 fa 14 b3 ff e9 36 ff ff ff e8 80\n[ +0.000014] RSP: 0018:ffffc90002657988 EFLAGS: 00010246\n[ +0.000013] RAX: 0000000000000000 RBX: 1ffff920004caf35 RCX: ffffffff8160565b\n[ +0.000011] RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff8881a9f78260\n[ +0.000010] RBP: ffffc90002657a70 R08: 0000000000000001 R09: fffff520004caf25\n[ +0.000010] R10: 0000000000000003 R11: ffffffff8161d1d6 R12: ffff88810e988c00\n[ +0.000010] R13: ffff888126fb5a00 R14: ffff88810e988c0c R15: ffff8881a9f78260\n[ +0.000011] FS: 00007ff9ec848540(0000) GS:ffff8883cc880000(0000) knlGS:0000000000000000\n[ +0.000012] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ +0.000010] CR2: 000055b3f7e14328 CR3: 00000001b5770000 CR4: 0000000000350ef0\n[ +0.000010] Call Trace:\n[ +0.000006] <TASK>\n[ +0.000007] ? show_regs+0x6a/0x80\n[ +0.000018] ? __warn+0xa5/0x1b0\n[ +0.000019] ? mmu_interval_notifier_remove+0x327/0x340\n[ +0.000018] ? report_bug+0x24a/0x290\n[ +0.000022] ? handle_bug+0x46/0x90\n[ +0.000015] ? exc_invalid_op+0x19/0x50\n[ +0.000016] ? asm_exc_invalid_op+0x1b/0x20\n[ +0.000017] ? kasan_save_stack+0x26/0x50\n[ +0.000017] ? mmu_interval_notifier_remove+0x23b/0x340\n[ +0.000019] ? mmu_interval_notifier_remove+0x327/0x340\n[ +0.000019] ? mmu_interval_notifier_remove+0x23b/0x340\n[ +0.000020] ? __pfx_mmu_interval_notifier_remove+0x10/0x10\n[ +0.000017] ? kasan_save_alloc_info+0x1e/0x30\n[ +0.000018] ? srso_return_thunk+0x5/0x5f\n[ +0.000014] ? __kasan_kmalloc+0xb1/0xc0\n[ +0.000018] ? srso_return_thunk+0x5/0x5f\n[ +0.000013] ? __kasan_check_read+0x11/0x20\n[ +0.000020] amdgpu_hmm_unregister+0x34/0x50 [amdgpu]\n[ +0.004695] amdgpu_gem_object_free+0x66/0xa0 [amdgpu]\n[ +0.004534] ? __pfx_amdgpu_gem_object_free+0x10/0x10 [amdgpu]\n[ +0.004291] ? do_syscall_64+0x5f/0xe0\n[ +0.000023] ? srso_return_thunk+0x5/0x5f\n[ +0.000017] drm_gem_object_free+0x3b/0x50 [drm]\n[ +0.000489] amdgpu_gem_userptr_ioctl+0x306/0x500 [amdgpu]\n[ +0.004295] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]\n[ +0.004270] ? srso_return_thunk+0x5/0x5f\n[ +0.000014] ? __this_cpu_preempt_check+0x13/0x20\n[ +0.000015] ? srso_return_thunk+0x5/0x5f\n[ +0.000013] ? sysvec_apic_timer_interrupt+0x57/0xc0\n[ +0.000020] ? srso_return_thunk+0x5/0x5f\n[ +0.000014] ? asm_sysvec_apic_timer_interrupt+0x1b/0x20\n[ +0.000022] ? drm_ioctl_kernel+0x17b/0x1f0 [drm]\n[ +0.000496] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]\n[ +0.004272] ? drm_ioctl_kernel+0x190/0x1f0 [drm]\n[ +0.000492] drm_ioctl_kernel+0x140/0x1f0 [drm]\n[ +0.000497] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]\n[ +0.004297] ? __pfx_drm_ioctl_kernel+0x10/0x10 [d\n---truncated---"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Triggered via `DRM_IOCTL_AMDGPU_GEM_USERPTR` on a local AMD GPU device node (`/dev/dri/renderD*` or `card*`); there is no remote or adjacent-network path to `amdgpu_gem_userptr_ioctl()`.\nAC:L - A single ioctl with a fully attacker-chosen `addr`/`size` (e.g. 0xffffffffffff0000 / 0x80000000) deterministically overflows the interval-tree range check and reaches the unbalanced `mmdrop()`; there is no race and no dependence on memory layout.\nPR:L - The ioctl is flagged `DRM_RENDER_ALLOW`, so `drm_ioctl_permit()` waives `DRM_AUTH` for render clients \u2014 any unprivileged local user or sandboxed app with an open render node (standard for desktop sessions, Android apps, and GPU-enabled containers) qualifies, with no capability check anywhere on the path.\nUI:N - The attacker performs the entire sequence itself by opening the render node and issuing the ioctl; no victim action or cooperation is required.\nS:U - The corruption stays within the kernel's own security authority \u2014 the calling process's `mm_struct` and mmu-notifier tree \u2014 with no crossing of a VM, IOMMU, or hypervisor boundary.\nC:H - The unbalanced `mmdrop()` frees the live `mm_struct` and its PGD while still in use; reclaiming those objects yields page-table control and therefore arbitrary kernel and cross-process memory disclosure.\nI:H - The same use-after-free plus the `interval_tree_remove()` of a never-inserted node give heap-spray-controlled write primitives \u2014 freeing an in-use PGD allows forging page-table entries for arbitrary memory modification and privilege escalation.\nA:H - The path hits a `WARN_ON` (immediate panic under `panic_on_warn`), corrupts the mm's notifier interval tree, and tears down the running process's page tables, reliably crashing the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c"], "versions": [{"version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "2e13f88e01ae7e28a7e831bf5c2409c4748e0a60", "status": "affected", "versionType": "git"}, {"version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "e87e08c94c9541b4e18c4c13f2f605935f512605", "status": "affected", "versionType": "git"}, {"version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "af054a5fb24a144f99895afce9519d709891894c", "status": "affected", "versionType": "git"}, {"version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "22f665ecfd1225afa1309ace623157d12bb9bb0c", "status": "affected", "versionType": "git"}, {"version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "22207fd5c80177b860279653d017474b2812af5e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c"], "versions": [{"version": "4.2", "status": "affected"}, {"version": "0", "lessThan": "4.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.132", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.24", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.7.12", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.8.3", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.9", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.1.132"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.6.24"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.7.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.8.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2", "versionEndExcluding": "6.9"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2e13f88e01ae7e28a7e831bf5c2409c4748e0a60"}, {"url": "https://git.kernel.org/stable/c/e87e08c94c9541b4e18c4c13f2f605935f512605"}, {"url": "https://git.kernel.org/stable/c/af054a5fb24a144f99895afce9519d709891894c"}, {"url": "https://git.kernel.org/stable/c/22f665ecfd1225afa1309ace623157d12bb9bb0c"}, {"url": "https://git.kernel.org/stable/c/22207fd5c80177b860279653d017474b2812af5e"}], "title": "drm/amdgpu: fix use-after-free bug", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-26656", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-04-02T14:54:50.822759Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-05T17:21:23.249Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/e87e08c94c9541b4e18c4c13f2f605935f512605", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/af054a5fb24a144f99895afce9519d709891894c", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/22f665ecfd1225afa1309ace623157d12bb9bb0c", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/22207fd5c80177b860279653d017474b2812af5e", "tags": ["x_transferred"]}, {"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:29:28.444Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/e87e08c94c9541b4e18c4c13f2f605935f512605", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/af054a5fb24a144f99895afce9519d709891894c", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/22f665ecfd1225afa1309ace623157d12bb9bb0c", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/22207fd5c80177b860279653d017474b2812af5e", "tags": ["x_transferred"]}, {"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:29:28.444Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-26656", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-04-02T14:54:50.822759Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-05T15:20:38.674Z"}}], "cna": {"title": "drm/amdgpu: fix use-after-free bug", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - Triggered via `DRM_IOCTL_AMDGPU_GEM_USERPTR` on a local AMD GPU device node (`/dev/dri/renderD*` or `card*`); there is no remote or adjacent-network path to `amdgpu_gem_userptr_ioctl()`.\nAC:L - A single ioctl with a fully attacker-chosen `addr`/`size` (e.g. 0xffffffffffff0000 / 0x80000000) deterministically overflows the interval-tree range check and reaches the unbalanced `mmdrop()`; there is no race and no dependence on memory layout.\nPR:L - The ioctl is flagged `DRM_RENDER_ALLOW`, so `drm_ioctl_permit()` waives `DRM_AUTH` for render clients \u2014 any unprivileged local user or sandboxed app with an open render node (standard for desktop sessions, Android apps, and GPU-enabled containers) qualifies, with no capability check anywhere on the path.\nUI:N - The attacker performs the entire sequence itself by opening the render node and issuing the ioctl; no victim action or cooperation is required.\nS:U - The corruption stays within the kernel's own security authority \u2014 the calling process's `mm_struct` and mmu-notifier tree \u2014 with no crossing of a VM, IOMMU, or hypervisor boundary.\nC:H - The unbalanced `mmdrop()` frees the live `mm_struct` and its PGD while still in use; reclaiming those objects yields page-table control and therefore arbitrary kernel and cross-process memory disclosure.\nI:H - The same use-after-free plus the `interval_tree_remove()` of a never-inserted node give heap-spray-controlled write primitives \u2014 freeing an in-use PGD allows forging page-table entries for arbitrary memory modification and privilege escalation.\nA:H - The path hits a `WARN_ON` (immediate panic under `panic_on_warn`), corrupts the mm's notifier interval tree, and tears down the running process's page tables, reliably crashing the kernel."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "2e13f88e01ae7e28a7e831bf5c2409c4748e0a60", "versionType": "git"}, {"status": "affected", "version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "e87e08c94c9541b4e18c4c13f2f605935f512605", "versionType": "git"}, {"status": "affected", "version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "af054a5fb24a144f99895afce9519d709891894c", "versionType": "git"}, {"status": "affected", "version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "22f665ecfd1225afa1309ace623157d12bb9bb0c", "versionType": "git"}, {"status": "affected", "version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "22207fd5c80177b860279653d017474b2812af5e", "versionType": "git"}], "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.2"}, {"status": "unaffected", "version": "0", "lessThan": "4.2", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.132", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.24", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.7.12", "versionType": "semver", "lessThanOrEqual": "6.7.*"}, {"status": "unaffected", "version": "6.8.3", "versionType": "semver", "lessThanOrEqual": "6.8.*"}, {"status": "unaffected", "version": "6.9", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/2e13f88e01ae7e28a7e831bf5c2409c4748e0a60"}, {"url": "https://git.kernel.org/stable/c/e87e08c94c9541b4e18c4c13f2f605935f512605"}, {"url": "https://git.kernel.org/stable/c/af054a5fb24a144f99895afce9519d709891894c"}, {"url": "https://git.kernel.org/stable/c/22f665ecfd1225afa1309ace623157d12bb9bb0c"}, {"url": "https://git.kernel.org/stable/c/22207fd5c80177b860279653d017474b2812af5e"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix use-after-free bug\n\nThe bug can be triggered by sending a single amdgpu_gem_userptr_ioctl\nto the AMDGPU DRM driver on any ASICs with an invalid address and size.\nThe bug was reported by Joonkyo Jung <joonkyoj@yonsei.ac.kr>.\nFor example the following code:\n\nstatic void Syzkaller1(int fd)\n{\n\tstruct drm_amdgpu_gem_userptr arg;\n\tint ret;\n\n\targ.addr = 0xffffffffffff0000;\n\targ.size = 0x80000000; /*2 Gb*/\n\targ.flags = 0x7;\n\tret = drmIoctl(fd, 0xc1186451/*amdgpu_gem_userptr_ioctl*/, &arg);\n}\n\nDue to the address and size are not valid there is a failure in\namdgpu_hmm_register->mmu_interval_notifier_insert->__mmu_interval_notifier_insert->\ncheck_shl_overflow, but we even the amdgpu_hmm_register failure we still call\namdgpu_hmm_unregister into amdgpu_gem_object_free which causes access to a bad address.\nThe following stack is below when the issue is reproduced when Kazan is enabled:\n\n[ +0.000014] Hardware name: ASUS System Product Name/ROG STRIX B550-F GAMING (WI-FI), BIOS 1401 12/03/2020\n[ +0.000009] RIP: 0010:mmu_interval_notifier_remove+0x327/0x340\n[ +0.000017] Code: ff ff 49 89 44 24 08 48 b8 00 01 00 00 00 00 ad de 4c 89 f7 49 89 47 40 48 83 c0 22 49 89 47 48 e8 ce d1 2d 01 e9 32 ff ff ff <0f> 0b e9 16 ff ff ff 4c 89 ef e8 fa 14 b3 ff e9 36 ff ff ff e8 80\n[ +0.000014] RSP: 0018:ffffc90002657988 EFLAGS: 00010246\n[ +0.000013] RAX: 0000000000000000 RBX: 1ffff920004caf35 RCX: ffffffff8160565b\n[ +0.000011] RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff8881a9f78260\n[ +0.000010] RBP: ffffc90002657a70 R08: 0000000000000001 R09: fffff520004caf25\n[ +0.000010] R10: 0000000000000003 R11: ffffffff8161d1d6 R12: ffff88810e988c00\n[ +0.000010] R13: ffff888126fb5a00 R14: ffff88810e988c0c R15: ffff8881a9f78260\n[ +0.000011] FS: 00007ff9ec848540(0000) GS:ffff8883cc880000(0000) knlGS:0000000000000000\n[ +0.000012] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ +0.000010] CR2: 000055b3f7e14328 CR3: 00000001b5770000 CR4: 0000000000350ef0\n[ +0.000010] Call Trace:\n[ +0.000006] <TASK>\n[ +0.000007] ? show_regs+0x6a/0x80\n[ +0.000018] ? __warn+0xa5/0x1b0\n[ +0.000019] ? mmu_interval_notifier_remove+0x327/0x340\n[ +0.000018] ? report_bug+0x24a/0x290\n[ +0.000022] ? handle_bug+0x46/0x90\n[ +0.000015] ? exc_invalid_op+0x19/0x50\n[ +0.000016] ? asm_exc_invalid_op+0x1b/0x20\n[ +0.000017] ? kasan_save_stack+0x26/0x50\n[ +0.000017] ? mmu_interval_notifier_remove+0x23b/0x340\n[ +0.000019] ? mmu_interval_notifier_remove+0x327/0x340\n[ +0.000019] ? mmu_interval_notifier_remove+0x23b/0x340\n[ +0.000020] ? __pfx_mmu_interval_notifier_remove+0x10/0x10\n[ +0.000017] ? kasan_save_alloc_info+0x1e/0x30\n[ +0.000018] ? srso_return_thunk+0x5/0x5f\n[ +0.000014] ? __kasan_kmalloc+0xb1/0xc0\n[ +0.000018] ? srso_return_thunk+0x5/0x5f\n[ +0.000013] ? __kasan_check_read+0x11/0x20\n[ +0.000020] amdgpu_hmm_unregister+0x34/0x50 [amdgpu]\n[ +0.004695] amdgpu_gem_object_free+0x66/0xa0 [amdgpu]\n[ +0.004534] ? __pfx_amdgpu_gem_object_free+0x10/0x10 [amdgpu]\n[ +0.004291] ? do_syscall_64+0x5f/0xe0\n[ +0.000023] ? srso_return_thunk+0x5/0x5f\n[ +0.000017] drm_gem_object_free+0x3b/0x50 [drm]\n[ +0.000489] amdgpu_gem_userptr_ioctl+0x306/0x500 [amdgpu]\n[ +0.004295] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]\n[ +0.004270] ? srso_return_thunk+0x5/0x5f\n[ +0.000014] ? __this_cpu_preempt_check+0x13/0x20\n[ +0.000015] ? srso_return_thunk+0x5/0x5f\n[ +0.000013] ? sysvec_apic_timer_interrupt+0x57/0xc0\n[ +0.000020] ? srso_return_thunk+0x5/0x5f\n[ +0.000014] ? asm_sysvec_apic_timer_interrupt+0x1b/0x20\n[ +0.000022] ? drm_ioctl_kernel+0x17b/0x1f0 [drm]\n[ +0.000496] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]\n[ +0.004272] ? drm_ioctl_kernel+0x190/0x1f0 [drm]\n[ +0.000492] drm_ioctl_kernel+0x140/0x1f0 [drm]\n[ +0.000497] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]\n[ +0.004297] ? __pfx_drm_ioctl_kernel+0x10/0x10 [d\n---truncated---"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.132", "versionStartIncluding": "4.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.24", "versionStartIncluding": "4.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.7.12", "versionStartIncluding": "4.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8.3", "versionStartIncluding": "4.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.9", "versionStartIncluding": "4.2"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:26:34.438Z"}}}, "cveMetadata": {"cveId": "CVE-2024-26656", "state": "PUBLISHED", "dateUpdated": "2026-08-05T11:26:34.438Z", "dateReserved": "2024-02-19T14:20:24.145Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-04-02T06:08:43.558Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "2e13f88e01ae7e28a7e831bf5c2409c4748e0a60", "status": "affected", "version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "versionType": "git"}, {"lessThan": "e87e08c94c9541b4e18c4c13f2f605935f512605", "status": "affected", "version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "versionType": "git"}, {"lessThan": "af054a5fb24a144f99895afce9519d709891894c", "status": "affected", "version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "versionType": "git"}, {"lessThan": "22f665ecfd1225afa1309ace623157d12bb9bb0c", "status": "affected", "version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "versionType": "git"}, {"lessThan": "22207fd5c80177b860279653d017474b2812af5e", "status": "affected", "version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.2"}, {"lessThan": "4.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.132", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.24", "versionType": "semver"}, {"lessThanOrEqual": "6.7.*", "status": "unaffected", "version": "6.7.12", "versionType": "semver"}, {"lessThanOrEqual": "6.8.*", "status": "unaffected", "version": "6.8.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.9", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "18FE1EAE-C36C-49FC-A5E0-0A661CDC561E", "versionEndExcluding": "6.9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix use-after-free bug\n\nThe bug can be triggered by sending a single amdgpu_gem_userptr_ioctl\nto the AMDGPU DRM driver on any ASICs with an invalid address and size.\nThe bug was reported by Joonkyo Jung <joonkyoj@yonsei.ac.kr>.\nFor example the following code:\n\nstatic void Syzkaller1(int fd)\n{\n\tstruct drm_amdgpu_gem_userptr arg;\n\tint ret;\n\n\targ.addr = 0xffffffffffff0000;\n\targ.size = 0x80000000; /*2 Gb*/\n\targ.flags = 0x7;\n\tret = drmIoctl(fd, 0xc1186451/*amdgpu_gem_userptr_ioctl*/, &arg);\n}\n\nDue to the address and size are not valid there is a failure in\namdgpu_hmm_register->mmu_interval_notifier_insert->__mmu_interval_notifier_insert->\ncheck_shl_overflow, but we even the amdgpu_hmm_register failure we still call\namdgpu_hmm_unregister into amdgpu_gem_object_free which causes access to a bad address.\nThe following stack is below when the issue is reproduced when Kazan is enabled:\n\n[ +0.000014] Hardware name: ASUS System Product Name/ROG STRIX B550-F GAMING (WI-FI), BIOS 1401 12/03/2020\n[ +0.000009] RIP: 0010:mmu_interval_notifier_remove+0x327/0x340\n[ +0.000017] Code: ff ff 49 89 44 24 08 48 b8 00 01 00 00 00 00 ad de 4c 89 f7 49 89 47 40 48 83 c0 22 49 89 47 48 e8 ce d1 2d 01 e9 32 ff ff ff <0f> 0b e9 16 ff ff ff 4c 89 ef e8 fa 14 b3 ff e9 36 ff ff ff e8 80\n[ +0.000014] RSP: 0018:ffffc90002657988 EFLAGS: 00010246\n[ +0.000013] RAX: 0000000000000000 RBX: 1ffff920004caf35 RCX: ffffffff8160565b\n[ +0.000011] RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff8881a9f78260\n[ +0.000010] RBP: ffffc90002657a70 R08: 0000000000000001 R09: fffff520004caf25\n[ +0.000010] R10: 0000000000000003 R11: ffffffff8161d1d6 R12: ffff88810e988c00\n[ +0.000010] R13: ffff888126fb5a00 R14: ffff88810e988c0c R15: ffff8881a9f78260\n[ +0.000011] FS: 00007ff9ec848540(0000) GS:ffff8883cc880000(0000) knlGS:0000000000000000\n[ +0.000012] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ +0.000010] CR2: 000055b3f7e14328 CR3: 00000001b5770000 CR4: 0000000000350ef0\n[ +0.000010] Call Trace:\n[ +0.000006] <TASK>\n[ +0.000007] ? show_regs+0x6a/0x80\n[ +0.000018] ? __warn+0xa5/0x1b0\n[ +0.000019] ? mmu_interval_notifier_remove+0x327/0x340\n[ +0.000018] ? report_bug+0x24a/0x290\n[ +0.000022] ? handle_bug+0x46/0x90\n[ +0.000015] ? exc_invalid_op+0x19/0x50\n[ +0.000016] ? asm_exc_invalid_op+0x1b/0x20\n[ +0.000017] ? kasan_save_stack+0x26/0x50\n[ +0.000017] ? mmu_interval_notifier_remove+0x23b/0x340\n[ +0.000019] ? mmu_interval_notifier_remove+0x327/0x340\n[ +0.000019] ? mmu_interval_notifier_remove+0x23b/0x340\n[ +0.000020] ? __pfx_mmu_interval_notifier_remove+0x10/0x10\n[ +0.000017] ? kasan_save_alloc_info+0x1e/0x30\n[ +0.000018] ? srso_return_thunk+0x5/0x5f\n[ +0.000014] ? __kasan_kmalloc+0xb1/0xc0\n[ +0.000018] ? srso_return_thunk+0x5/0x5f\n[ +0.000013] ? __kasan_check_read+0x11/0x20\n[ +0.000020] amdgpu_hmm_unregister+0x34/0x50 [amdgpu]\n[ +0.004695] amdgpu_gem_object_free+0x66/0xa0 [amdgpu]\n[ +0.004534] ? __pfx_amdgpu_gem_object_free+0x10/0x10 [amdgpu]\n[ +0.004291] ? do_syscall_64+0x5f/0xe0\n[ +0.000023] ? srso_return_thunk+0x5/0x5f\n[ +0.000017] drm_gem_object_free+0x3b/0x50 [drm]\n[ +0.000489] amdgpu_gem_userptr_ioctl+0x306/0x500 [amdgpu]\n[ +0.004295] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]\n[ +0.004270] ? srso_return_thunk+0x5/0x5f\n[ +0.000014] ? __this_cpu_preempt_check+0x13/0x20\n[ +0.000015] ? srso_return_thunk+0x5/0x5f\n[ +0.000013] ? sysvec_apic_timer_interrupt+0x57/0xc0\n[ +0.000020] ? srso_return_thunk+0x5/0x5f\n[ +0.000014] ? asm_sysvec_apic_timer_interrupt+0x1b/0x20\n[ +0.000022] ? drm_ioctl_kernel+0x17b/0x1f0 [drm]\n[ +0.000496] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]\n[ +0.004272] ? drm_ioctl_kernel+0x190/0x1f0 [drm]\n[ +0.000492] drm_ioctl_kernel+0x140/0x1f0 [drm]\n[ +0.000497] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]\n[ +0.004297] ? __pfx_drm_ioctl_kernel+0x10/0x10 [d\n---truncated---"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: drm/amdgpu: corrige el error de use-after-free. El error se puede activar enviando un solo amdgpu_gem_userptr_ioctl al controlador DRM AMDGPU en cualquier ASIC con una direcci\u00f3n y tama\u00f1o no v\u00e1lidos. El error fue reportado por Joonkyo Jung . Por ejemplo, el siguiente c\u00f3digo: static void Syzkaller1(int fd) { struct drm_amdgpu_gem_userptr arg; ret int; arg.addr = 0xffffffffffff0000; arg.tama\u00f1o = 0x80000000; /*2 Gb*/ arg.flags = 0x7; ret = drmIoctl(fd, 0xc1186451/*amdgpu_gem_userptr_ioctl*/, &amp;arg); } Debido a que la direcci\u00f3n y el tama\u00f1o no son v\u00e1lidos, hay una falla en amdgpu_hmm_register-&gt;mmu_interval_notifier_insert-&gt;__mmu_interval_notifier_insert-&gt; check_shl_overflow, pero incluso en la falla de amdgpu_hmm_register todav\u00eda llamamos a amdgpu_hmm_unregister en amdgpu_gem_object_free, lo que provoca el acceso a una direcci\u00f3n incorrecta. La siguiente pila se muestra a continuaci\u00f3n cuando el problema se reproduce cuando Kazan est\u00e1 habilitado: [+0.000014] Nombre del hardware: Nombre del producto del sistema ASUS/ROG STRIX B550-F GAMING (WI-FI), BIOS 1401 03/12/2020 [+0.000009] RIP: 0010:mmu_interval_notifier_remove+0x327/0x340 [ +0.000017] C\u00f3digo: ff ff 49 89 44 24 08 48 b8 00 01 00 00 00 00 ad de 4c 89 f7 49 89 47 40 48 83 c0 22 49 89 47 48 e8 ce d1 2d 01 e9 32 ff ff ff &lt;0f&gt; 0b e9 16 ff ff ff 4c 89 ef e8 fa 14 b3 ff e9 36 ff ff ff e8 80 [ +0.000014] RSP: 0018:ffffc90002657988 EFLAGS: 00010246 [ +0.000 013] RAX: 0000000000000000 RBX: 1ffff920004caf35 RCX: ffffffff8160565b [ +0.000011] RDX: dffffc0000000000 RSI: 00000000000000004 RDI: ffff8881a9f78260 [ +0.000010] RBP: ffffc90002 657a70 R08: 0000000000000001 R09: fffff520004caf25 [ +0.000010] R10: 0000000000000003 R11: ffffffff8161d1d6 R12: ffff88810e988c00 [ +0.000010] R1 3 : ffff888126fb5a00 R14: ffff88810e988c0c R15: ffff8881a9f78260 [ +0.000011] FS: 00007ff9ec848540(0000) GS:ffff8883cc880000(0000) knlGS:000000000 0000000 [ +0,000012] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ +0,000010] CR2: 000055b3f7e14328 CR3: 00000001b5770000 CR4: 0000000000350ef0 [+0.000010] Seguimiento de llamadas: [+0.000006] [+0.000007] ? show_regs+0x6a/0x80 [+0.000018]? __advertir+0xa5/0x1b0 [ +0.000019] ? mmu_interval_notifier_remove+0x327/0x340 [+0.000018]? report_bug+0x24a/0x290 [+0.000022] ? handle_bug+0x46/0x90 [+0.000015]? exc_invalid_op+0x19/0x50 [+0.000016]? asm_exc_invalid_op+0x1b/0x20 [+0.000017]? kasan_save_stack+0x26/0x50 [+0.000017]? mmu_interval_notifier_remove+0x23b/0x340 [+0.000019]? mmu_interval_notifier_remove+0x327/0x340 [+0.000019]? mmu_interval_notifier_remove+0x23b/0x340 [+0.000020]? __pfx_mmu_interval_notifier_remove+0x10/0x10 [ +0.000017] ? kasan_save_alloc_info+0x1e/0x30 [ +0.000018] ? srso_return_thunk+0x5/0x5f [+0.000014]? __kasan_kmalloc+0xb1/0xc0 [ +0.000018] ? srso_return_thunk+0x5/0x5f [+0.000013]? __kasan_check_read+0x11/0x20 [ +0.000020] amdgpu_hmm_unregister+0x34/0x50 [amdgpu] [ +0.004695] amdgpu_gem_object_free+0x66/0xa0 [amdgpu] [ +0.004534] ? __pfx_amdgpu_gem_object_free+0x10/0x10 [amdgpu] [ +0.004291] ? do_syscall_64+0x5f/0xe0 [+0.000023]? srso_return_thunk+0x5/0x5f [ +0.000017] drm_gem_object_free+0x3b/0x50 [drm] [ +0.000489] amdgpu_gem_userptr_ioctl+0x306/0x500 [amdgpu] [ +0.004295] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu] [ +0.004270] ? srso_return_thunk+0x5/0x5f [+0.000014]? __this_cpu_preempt_check+0x13/0x20 [ +0.000015] ? srso_return_thunk+0x5/0x5f [+0.000013]? sysvec_apic_timer_interrupt+0x57/0xc0 [+0.000020]? srso_return_thunk+0x5/0x5f [+0.000014]? asm_sysvec_apic_timer_interrupt+0x1b/0x20 [+0.000022]? drm_ioctl_kernel+0x17b/0x1f0 [drm] [ +0.000496] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu] [ +0.004272] ? drm_ioctl_kernel+0x190/0x1f0 [drm] [ +0.000492] drm_ioctl_kernel+0x140/0x1f0 [drm] [ +0.000497] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu] [ +0.004297] ? __pfx_drm_ioctl_kernel+0x10/0x10 [d ---truncado---"}], "id": "CVE-2024-26656", "lastModified": "2026-08-04T11:16:53.907", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-26656", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-04-02T14:54:50.822759Z", "version": "2.0.3"}}]}, "published": "2024-04-02T07:15:42.760", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22207fd5c80177b860279653d017474b2812af5e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22f665ecfd1225afa1309ace623157d12bb9bb0c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2e13f88e01ae7e28a7e831bf5c2409c4748e0a60"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/af054a5fb24a144f99895afce9519d709891894c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e87e08c94c9541b4e18c4c13f2f605935f512605"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22207fd5c80177b860279653d017474b2812af5e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22f665ecfd1225afa1309ace623157d12bb9bb0c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/af054a5fb24a144f99895afce9519d709891894c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e87e08c94c9541b4e18c4c13f2f605935f512605"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:4352", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.8.1.rt7.349.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-07-08T00:00:00Z"}, {"advisory": "RHSA-2024:4211", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.8.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-07-02T00:00:00Z"}, {"advisory": "RHSA-2024:9500", "cpe": "cpe:/o:redhat:rhel_aus:8.6", "package": "kernel-0:4.18.0-372.129.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date": "2024-11-13T00:00:00Z"}, {"advisory": "RHSA-2024:9500", "cpe": "cpe:/o:redhat:rhel_tus:8.6", "package": "kernel-0:4.18.0-372.129.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date": "2024-11-13T00:00:00Z"}, {"advisory": "RHSA-2024:9500", "cpe": "cpe:/o:redhat:rhel_e4s:8.6", "package": "kernel-0:4.18.0-372.129.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date": "2024-11-13T00:00:00Z"}, {"advisory": "RHSA-2024:4740", "cpe": "cpe:/o:redhat:rhel_eus:8.8", "package": "kernel-0:4.18.0-477.64.1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2024-07-23T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9497", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "kernel-0:5.14.0-284.92.1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-11-13T00:00:00Z"}, {"advisory": "RHSA-2024:9498", "cpe": "cpe:/a:redhat:rhel_eus:9.2::nfv", "package": "kernel-rt-0:5.14.0-284.92.1.rt14.377.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-11-13T00:00:00Z"}, {"advisory": "RHSA-2024:9546", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "kernel-0:5.14.0-427.44.1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2024-11-13T00:00:00Z"}], "bugzilla": {"description": "kernel: drm/amdgpu: use-after-free vulnerability", "id": "2272692", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2272692"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/amdgpu: fix use-after-free bug\nThe bug can be triggered by sending a single amdgpu_gem_userptr_ioctl\nto the AMDGPU DRM driver on any ASICs with an invalid address and size.\nThe bug was reported by Joonkyo Jung <joonkyoj@yonsei.ac.kr>.\nFor example the following code:\nstatic void Syzkaller1(int fd)\n{\nstruct drm_amdgpu_gem_userptr arg;\nint ret;\narg.addr = 0xffffffffffff0000;\narg.size = 0x80000000; /*2 Gb*/\narg.flags = 0x7;\nret = drmIoctl(fd, 0xc1186451/*amdgpu_gem_userptr_ioctl*/, &arg);\n}\nDue to the address and size are not valid there is a failure in\namdgpu_hmm_register->mmu_interval_notifier_insert->__mmu_interval_notifier_insert->\ncheck_shl_overflow, but we even the amdgpu_hmm_register failure we still call\namdgpu_hmm_unregister into amdgpu_gem_object_free which causes access to a bad address.\nThe following stack is below when the issue is reproduced when Kazan is enabled:\n[ +0.000014] Hardware name: ASUS System Product Name/ROG STRIX B550-F GAMING (WI-FI), BIOS 1401 12/03/2020\n[ +0.000009] RIP: 0010:mmu_interval_notifier_remove+0x327/0x340\n[ +0.000017] Code: ff ff 49 89 44 24 08 48 b8 00 01 00 00 00 00 ad de 4c 89 f7 49 89 47 40 48 83 c0 22 49 89 47 48 e8 ce d1 2d 01 e9 32 ff ff ff <0f> 0b e9 16 ff ff ff 4c 89 ef e8 fa 14 b3 ff e9 36 ff ff ff e8 80\n[ +0.000014] RSP: 0018:ffffc90002657988 EFLAGS: 00010246\n[ +0.000013] RAX: 0000000000000000 RBX: 1ffff920004caf35 RCX: ffffffff8160565b\n[ +0.000011] RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff8881a9f78260\n[ +0.000010] RBP: ffffc90002657a70 R08: 0000000000000001 R09: fffff520004caf25\n[ +0.000010] R10: 0000000000000003 R11: ffffffff8161d1d6 R12: ffff88810e988c00\n[ +0.000010] R13: ffff888126fb5a00 R14: ffff88810e988c0c R15: ffff8881a9f78260\n[ +0.000011] FS: 00007ff9ec848540(0000) GS:ffff8883cc880000(0000) knlGS:0000000000000000\n[ +0.000012] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ +0.000010] CR2: 000055b3f7e14328 CR3: 00000001b5770000 CR4: 0000000000350ef0\n[ +0.000010] Call Trace:\n[ +0.000006] <TASK>\n[ +0.000007] ? show_regs+0x6a/0x80\n[ +0.000018] ? __warn+0xa5/0x1b0\n[ +0.000019] ? mmu_interval_notifier_remove+0x327/0x340\n[ +0.000018] ? report_bug+0x24a/0x290\n[ +0.000022] ? handle_bug+0x46/0x90\n[ +0.000015] ? exc_invalid_op+0x19/0x50\n[ +0.000016] ? asm_exc_invalid_op+0x1b/0x20\n[ +0.000017] ? kasan_save_stack+0x26/0x50\n[ +0.000017] ? mmu_interval_notifier_remove+0x23b/0x340\n[ +0.000019] ? mmu_interval_notifier_remove+0x327/0x340\n[ +0.000019] ? mmu_interval_notifier_remove+0x23b/0x340\n[ +0.000020] ? __pfx_mmu_interval_notifier_remove+0x10/0x10\n[ +0.000017] ? kasan_save_alloc_info+0x1e/0x30\n[ +0.000018] ? srso_return_thunk+0x5/0x5f\n[ +0.000014] ? __kasan_kmalloc+0xb1/0xc0\n[ +0.000018] ? srso_return_thunk+0x5/0x5f\n[ +0.000013] ? __kasan_check_read+0x11/0x20\n[ +0.000020] amdgpu_hmm_unregister+0x34/0x50 [amdgpu]\n[ +0.004695] amdgpu_gem_object_free+0x66/0xa0 [amdgpu]\n[ +0.004534] ? __pfx_amdgpu_gem_object_free+0x10/0x10 [amdgpu]\n[ +0.004291] ? do_syscall_64+0x5f/0xe0\n[ +0.000023] ? srso_return_thunk+0x5/0x5f\n[ +0.000017] drm_gem_object_free+0x3b/0x50 [drm]\n[ +0.000489] amdgpu_gem_userptr_ioctl+0x306/0x500 [amdgpu]\n[ +0.004295] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]\n[ +0.004270] ? srso_return_thunk+0x5/0x5f\n[ +0.000014] ? __this_cpu_preempt_check+0x13/0x20\n[ +0.000015] ? srso_return_thunk+0x5/0x5f\n[ +0.000013] ? sysvec_apic_timer_interrupt+0x57/0xc0\n[ +0.000020] ? srso_return_thunk+0x5/0x5f\n[ +0.000014] ? asm_sysvec_apic_timer_interrupt+0x1b/0x20\n[ +0.000022] ? drm_ioctl_kernel+0x17b/0x1f0 [drm]\n[ +0.000496] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]\n[ +0.004272] ? drm_ioctl_kernel+0x190/0x1f0 [drm]\n[ +0.000492] drm_ioctl_kernel+0x140/0x1f0 [drm]\n[ +0.000497] ? __pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu]\n[ +0.004297] ? __pfx_drm_ioctl_kernel+0x10/0x10 [d\n---truncated---", "A failure flaw was found in the Linux kernel\u2019s AMDGPU driver in how a user sends ioctl with an invalid address and size when using the AMD GPU. This flaw allows a local user to crash the system."], "name": "CVE-2024-26656", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-04-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26656\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26656\nhttps://lore.kernel.org/linux-cve-announce/2024040247-CVE-2024-26656-ffaa@gregkh/T"], "statement": "Within regulated environments, a combination of the following controls acts as a significant barrier to successfully exploiting a CWE-416: Use After Free vulnerability and therefore downgrades the severity of this particular CVE from Moderate to Low.\nAccess to the platform is granted only after successful hard token-based multi-factor authentication (MFA) and is governed by least privilege to ensure that only authorized users and roles can execute or modify code. Red Hat also enforces least functionality, enabling only essential features, services, and ports. Hardening guidelines ensure the most restrictive settings required for operations, while baseline configurations enforce safe memory allocation and deallocation practices to reduce the risk of use-after-free vulnerabilities. The environment employs IPS/IDS and antimalware solutions to detect and prevent malicious code and provide real-time visibility into memory usage, lowering the risk of arbitrary code execution. Static code analysis and peer reviews enforce strong input validation and error handling, reducing the likelihood of denial-of-service (DoS) attacks. In the event of successful exploitation, process isolation prevents a compromised process from accessing memory freed by another, containing potential impact. Finally, memory protection mechanisms such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) enhance resilience against memory-related vulnerabilities.", "threat_severity": "Moderate"}

{}