CVE-2026-43237

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43237", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.995Z", "datePublished": "2026-05-06T11:28:32.300Z", "dateUpdated": "2026-10-19T19:16:25.016Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:48.364Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: Refactor amdgpu_gem_va_ioctl for Handling Last Fence Update and Timeline Management v4\n\nThis commit simplifies the amdgpu_gem_va_ioctl function, key updates\ninclude:\n - Moved the logic for managing the last update fence directly into\n amdgpu_gem_va_update_vm.\n - Introduced checks for the timeline point to enable conditional\n replacement or addition of fences.\n\nv2: Addressed review comments from Christian.\nv3: Updated comments (Christian).\nv4: The previous version selected the fence too early and did not manage its\n reference correctly, which could lead to stale or freed fences being used.\n This resulted in refcount underflows and could crash when updating GPU\n timelines.\n The fence is now chosen only after the VA mapping work is completed, and its\n reference is taken safely. After exporting it to the VM timeline syncobj, the\n driver always drops its local fence reference, ensuring balanced refcounting\n and avoiding use-after-free on dma_fence.\n\n\tCrash signature:\n\t[ 205.828135] refcount_t: underflow; use-after-free.\n\t[ 205.832963] WARNING: CPU: 30 PID: 7274 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110\n\t...\n\t[ 206.074014] Call Trace:\n\t[ 206.076488] <TASK>\n\t[ 206.078608] amdgpu_gem_va_ioctl+0x6ea/0x740 [amdgpu]\n\t[ 206.084040] ? __pfx_amdgpu_gem_va_ioctl+0x10/0x10 [amdgpu]\n\t[ 206.089994] drm_ioctl_kernel+0x86/0xe0 [drm]\n\t[ 206.094415] drm_ioctl+0x26e/0x520 [drm]\n\t[ 206.098424] ? __pfx_amdgpu_gem_va_ioctl+0x10/0x10 [amdgpu]\n\t[ 206.104402] amdgpu_drm_ioctl+0x4b/0x80 [amdgpu]\n\t[ 206.109387] __x64_sys_ioctl+0x96/0xe0\n\t[ 206.113156] do_syscall_64+0x66/0x2d0\n\t...\n\t[ 206.553351] BUG: unable to handle page fault for address: ffffffffc0dfde90\n\t...\n\t[ 206.553378] RIP: 0010:dma_fence_signal_timestamp_locked+0x39/0xe0\n\t...\n\t[ 206.553405] Call Trace:\n\t[ 206.553409] <IRQ>\n\t[ 206.553415] ? __pfx_drm_sched_fence_free_rcu+0x10/0x10 [gpu_sched]\n\t[ 206.553424] dma_fence_signal+0x30/0x60\n\t[ 206.553427] drm_sched_job_done.isra.0+0x123/0x150 [gpu_sched]\n\t[ 206.553434] dma_fence_signal_timestamp_locked+0x6e/0xe0\n\t[ 206.553437] dma_fence_signal+0x30/0x60\n\t[ 206.553441] amdgpu_fence_process+0xd8/0x150 [amdgpu]\n\t[ 206.553854] sdma_v4_0_process_trap_irq+0x97/0xb0 [amdgpu]\n\t[ 206.554353] edac_mce_amd(E) ee1004(E)\n\t[ 206.554270] amdgpu_irq_dispatch+0x150/0x230 [amdgpu]\n\t[ 206.554702] amdgpu_ih_process+0x6a/0x180 [amdgpu]\n\t[ 206.555101] amdgpu_irq_handler+0x23/0x60 [amdgpu]\n\t[ 206.555500] __handle_irq_event_percpu+0x4a/0x1c0\n\t[ 206.555506] handle_irq_event+0x38/0x80\n\t[ 206.555509] handle_edge_irq+0x92/0x1e0\n\t[ 206.555513] __common_interrupt+0x3e/0xb0\n\t[ 206.555519] common_interrupt+0x80/0xa0\n\t[ 206.555525] </IRQ>\n\t[ 206.555527] <TASK>\n\t...\n\t[ 206.555650] RIP: 0010:dma_fence_signal_timestamp_locked+0x39/0xe0\n\t...\n\t[ 206.555667] Kernel panic - not syncing: Fatal exception in interrupt"}], "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 - The vulnerable path is reached through the local AMDGPU DRM `AMDGPU_GEM_VA` ioctl on `/dev/dri` render/primary nodes, not via network packets or physical hotplug.\nAC:L - The attacker controls the ioctl sequence, GEM objects, VM mappings, syncobj timeline output, and can repeatedly trigger the fence lifetime bug without relying on conditions outside their control.\nPR:L - The ioctl is `DRM_AUTH|DRM_RENDER_ALLOW`, so an unprivileged local user with access to the AMDGPU render node can reach it; no real root or init-namespace capability is required.\nUI:N - Once the attacker has local access to the device node, exploitation only requires issuing ioctls and does not require any victim user action.\nS:U - The bug corrupts kernel/driver synchronization state from within the same host kernel security authority; it is not a VM escape or IOMMU/DMA boundary bypass.\nC:H - The bug is a use-after-free/stale `dma_fence` reference in kernel memory, and such fence object reuse can be groomed into broader kernel memory disclosure primitives.\nI:H - The freed `dma_fence` contains pointers, callback lists, and synchronization state used later by kernel code, making control-flow or arbitrary kernel memory modification defensible for scoring.\nA:H - The documented failure includes refcount underflow, page fault in `dma_fence_signal_timestamp_locked`, interrupt-context crash, and kernel panic."}]}], "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_gem.c"], "versions": [{"version": "70773bef4e091ff6d2a91e3dfb4f29013eb81f1f", "lessThan": "e9e477d3197f7d8955a042c0d7f53f78f13218ba", "status": "affected", "versionType": "git"}, {"version": "70773bef4e091ff6d2a91e3dfb4f29013eb81f1f", "lessThan": "0399b8416ecf64ef86ad23401fe23eabdb07831a", "status": "affected", "versionType": "git"}, {"version": "70773bef4e091ff6d2a91e3dfb4f29013eb81f1f", "lessThan": "bd8150a1b3370a9f7761c5814202a3fe5a79f44f", "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_gem.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.6", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.16", "versionEndExcluding": "6.18.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.19.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e9e477d3197f7d8955a042c0d7f53f78f13218ba"}, {"url": "https://git.kernel.org/stable/c/0399b8416ecf64ef86ad23401fe23eabdb07831a"}, {"url": "https://git.kernel.org/stable/c/bd8150a1b3370a9f7761c5814202a3fe5a79f44f"}], "title": "drm/amdgpu: Refactor amdgpu_gem_va_ioctl for Handling Last Fence Update and Timeline Management v4", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43237", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:15:58.192965Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:16:25.016Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43237", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:15:58.192965Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:15:58.736Z"}}], "cna": {"title": "drm/amdgpu: Refactor amdgpu_gem_va_ioctl for Handling Last Fence Update and Timeline Management v4", "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 - The vulnerable path is reached through the local AMDGPU DRM `AMDGPU_GEM_VA` ioctl on `/dev/dri` render/primary nodes, not via network packets or physical hotplug.\nAC:L - The attacker controls the ioctl sequence, GEM objects, VM mappings, syncobj timeline output, and can repeatedly trigger the fence lifetime bug without relying on conditions outside their control.\nPR:L - The ioctl is `DRM_AUTH|DRM_RENDER_ALLOW`, so an unprivileged local user with access to the AMDGPU render node can reach it; no real root or init-namespace capability is required.\nUI:N - Once the attacker has local access to the device node, exploitation only requires issuing ioctls and does not require any victim user action.\nS:U - The bug corrupts kernel/driver synchronization state from within the same host kernel security authority; it is not a VM escape or IOMMU/DMA boundary bypass.\nC:H - The bug is a use-after-free/stale `dma_fence` reference in kernel memory, and such fence object reuse can be groomed into broader kernel memory disclosure primitives.\nI:H - The freed `dma_fence` contains pointers, callback lists, and synchronization state used later by kernel code, making control-flow or arbitrary kernel memory modification defensible for scoring.\nA:H - The documented failure includes refcount underflow, page fault in `dma_fence_signal_timestamp_locked`, interrupt-context crash, and kernel panic."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "70773bef4e091ff6d2a91e3dfb4f29013eb81f1f", "lessThan": "e9e477d3197f7d8955a042c0d7f53f78f13218ba", "versionType": "git"}, {"status": "affected", "version": "70773bef4e091ff6d2a91e3dfb4f29013eb81f1f", "lessThan": "0399b8416ecf64ef86ad23401fe23eabdb07831a", "versionType": "git"}, {"status": "affected", "version": "70773bef4e091ff6d2a91e3dfb4f29013eb81f1f", "lessThan": "bd8150a1b3370a9f7761c5814202a3fe5a79f44f", "versionType": "git"}], "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"status": "unaffected", "version": "0", "lessThan": "6.16", "versionType": "semver"}, {"status": "unaffected", "version": "6.18.16", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.6", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/e9e477d3197f7d8955a042c0d7f53f78f13218ba"}, {"url": "https://git.kernel.org/stable/c/0399b8416ecf64ef86ad23401fe23eabdb07831a"}, {"url": "https://git.kernel.org/stable/c/bd8150a1b3370a9f7761c5814202a3fe5a79f44f"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: Refactor amdgpu_gem_va_ioctl for Handling Last Fence Update and Timeline Management v4\n\nThis commit simplifies the amdgpu_gem_va_ioctl function, key updates\ninclude:\n - Moved the logic for managing the last update fence directly into\n amdgpu_gem_va_update_vm.\n - Introduced checks for the timeline point to enable conditional\n replacement or addition of fences.\n\nv2: Addressed review comments from Christian.\nv3: Updated comments (Christian).\nv4: The previous version selected the fence too early and did not manage its\n reference correctly, which could lead to stale or freed fences being used.\n This resulted in refcount underflows and could crash when updating GPU\n timelines.\n The fence is now chosen only after the VA mapping work is completed, and its\n reference is taken safely. After exporting it to the VM timeline syncobj, the\n driver always drops its local fence reference, ensuring balanced refcounting\n and avoiding use-after-free on dma_fence.\n\n\tCrash signature:\n\t[ 205.828135] refcount_t: underflow; use-after-free.\n\t[ 205.832963] WARNING: CPU: 30 PID: 7274 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110\n\t...\n\t[ 206.074014] Call Trace:\n\t[ 206.076488] <TASK>\n\t[ 206.078608] amdgpu_gem_va_ioctl+0x6ea/0x740 [amdgpu]\n\t[ 206.084040] ? __pfx_amdgpu_gem_va_ioctl+0x10/0x10 [amdgpu]\n\t[ 206.089994] drm_ioctl_kernel+0x86/0xe0 [drm]\n\t[ 206.094415] drm_ioctl+0x26e/0x520 [drm]\n\t[ 206.098424] ? __pfx_amdgpu_gem_va_ioctl+0x10/0x10 [amdgpu]\n\t[ 206.104402] amdgpu_drm_ioctl+0x4b/0x80 [amdgpu]\n\t[ 206.109387] __x64_sys_ioctl+0x96/0xe0\n\t[ 206.113156] do_syscall_64+0x66/0x2d0\n\t...\n\t[ 206.553351] BUG: unable to handle page fault for address: ffffffffc0dfde90\n\t...\n\t[ 206.553378] RIP: 0010:dma_fence_signal_timestamp_locked+0x39/0xe0\n\t...\n\t[ 206.553405] Call Trace:\n\t[ 206.553409] <IRQ>\n\t[ 206.553415] ? __pfx_drm_sched_fence_free_rcu+0x10/0x10 [gpu_sched]\n\t[ 206.553424] dma_fence_signal+0x30/0x60\n\t[ 206.553427] drm_sched_job_done.isra.0+0x123/0x150 [gpu_sched]\n\t[ 206.553434] dma_fence_signal_timestamp_locked+0x6e/0xe0\n\t[ 206.553437] dma_fence_signal+0x30/0x60\n\t[ 206.553441] amdgpu_fence_process+0xd8/0x150 [amdgpu]\n\t[ 206.553854] sdma_v4_0_process_trap_irq+0x97/0xb0 [amdgpu]\n\t[ 206.554353] edac_mce_amd(E) ee1004(E)\n\t[ 206.554270] amdgpu_irq_dispatch+0x150/0x230 [amdgpu]\n\t[ 206.554702] amdgpu_ih_process+0x6a/0x180 [amdgpu]\n\t[ 206.555101] amdgpu_irq_handler+0x23/0x60 [amdgpu]\n\t[ 206.555500] __handle_irq_event_percpu+0x4a/0x1c0\n\t[ 206.555506] handle_irq_event+0x38/0x80\n\t[ 206.555509] handle_edge_irq+0x92/0x1e0\n\t[ 206.555513] __common_interrupt+0x3e/0xb0\n\t[ 206.555519] common_interrupt+0x80/0xa0\n\t[ 206.555525] </IRQ>\n\t[ 206.555527] <TASK>\n\t...\n\t[ 206.555650] RIP: 0010:dma_fence_signal_timestamp_locked+0x39/0xe0\n\t...\n\t[ 206.555667] Kernel panic - not syncing: Fatal exception in interrupt"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.16", "versionStartIncluding": "6.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.6", "versionStartIncluding": "6.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "6.16"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:48.364Z"}}}, "cveMetadata": {"cveId": "CVE-2026-43237", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:16:25.016Z", "dateReserved": "2026-05-01T14:12:55.995Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-06T11:28:32.300Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "e9e477d3197f7d8955a042c0d7f53f78f13218ba", "status": "affected", "version": "70773bef4e091ff6d2a91e3dfb4f29013eb81f1f", "versionType": "git"}, {"lessThan": "0399b8416ecf64ef86ad23401fe23eabdb07831a", "status": "affected", "version": "70773bef4e091ff6d2a91e3dfb4f29013eb81f1f", "versionType": "git"}, {"lessThan": "bd8150a1b3370a9f7761c5814202a3fe5a79f44f", "status": "affected", "version": "70773bef4e091ff6d2a91e3dfb4f29013eb81f1f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"lessThan": "6.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.16", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B4562EDA-AFEA-4C62-97CC-C83E109A5F19", "versionEndExcluding": "6.18.16", "versionStartIncluding": "6.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67", "versionEndExcluding": "6.19.6", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: Refactor amdgpu_gem_va_ioctl for Handling Last Fence Update and Timeline Management v4\n\nThis commit simplifies the amdgpu_gem_va_ioctl function, key updates\ninclude:\n - Moved the logic for managing the last update fence directly into\n amdgpu_gem_va_update_vm.\n - Introduced checks for the timeline point to enable conditional\n replacement or addition of fences.\n\nv2: Addressed review comments from Christian.\nv3: Updated comments (Christian).\nv4: The previous version selected the fence too early and did not manage its\n reference correctly, which could lead to stale or freed fences being used.\n This resulted in refcount underflows and could crash when updating GPU\n timelines.\n The fence is now chosen only after the VA mapping work is completed, and its\n reference is taken safely. After exporting it to the VM timeline syncobj, the\n driver always drops its local fence reference, ensuring balanced refcounting\n and avoiding use-after-free on dma_fence.\n\n\tCrash signature:\n\t[ 205.828135] refcount_t: underflow; use-after-free.\n\t[ 205.832963] WARNING: CPU: 30 PID: 7274 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110\n\t...\n\t[ 206.074014] Call Trace:\n\t[ 206.076488] <TASK>\n\t[ 206.078608] amdgpu_gem_va_ioctl+0x6ea/0x740 [amdgpu]\n\t[ 206.084040] ? __pfx_amdgpu_gem_va_ioctl+0x10/0x10 [amdgpu]\n\t[ 206.089994] drm_ioctl_kernel+0x86/0xe0 [drm]\n\t[ 206.094415] drm_ioctl+0x26e/0x520 [drm]\n\t[ 206.098424] ? __pfx_amdgpu_gem_va_ioctl+0x10/0x10 [amdgpu]\n\t[ 206.104402] amdgpu_drm_ioctl+0x4b/0x80 [amdgpu]\n\t[ 206.109387] __x64_sys_ioctl+0x96/0xe0\n\t[ 206.113156] do_syscall_64+0x66/0x2d0\n\t...\n\t[ 206.553351] BUG: unable to handle page fault for address: ffffffffc0dfde90\n\t...\n\t[ 206.553378] RIP: 0010:dma_fence_signal_timestamp_locked+0x39/0xe0\n\t...\n\t[ 206.553405] Call Trace:\n\t[ 206.553409] <IRQ>\n\t[ 206.553415] ? __pfx_drm_sched_fence_free_rcu+0x10/0x10 [gpu_sched]\n\t[ 206.553424] dma_fence_signal+0x30/0x60\n\t[ 206.553427] drm_sched_job_done.isra.0+0x123/0x150 [gpu_sched]\n\t[ 206.553434] dma_fence_signal_timestamp_locked+0x6e/0xe0\n\t[ 206.553437] dma_fence_signal+0x30/0x60\n\t[ 206.553441] amdgpu_fence_process+0xd8/0x150 [amdgpu]\n\t[ 206.553854] sdma_v4_0_process_trap_irq+0x97/0xb0 [amdgpu]\n\t[ 206.554353] edac_mce_amd(E) ee1004(E)\n\t[ 206.554270] amdgpu_irq_dispatch+0x150/0x230 [amdgpu]\n\t[ 206.554702] amdgpu_ih_process+0x6a/0x180 [amdgpu]\n\t[ 206.555101] amdgpu_irq_handler+0x23/0x60 [amdgpu]\n\t[ 206.555500] __handle_irq_event_percpu+0x4a/0x1c0\n\t[ 206.555506] handle_irq_event+0x38/0x80\n\t[ 206.555509] handle_edge_irq+0x92/0x1e0\n\t[ 206.555513] __common_interrupt+0x3e/0xb0\n\t[ 206.555519] common_interrupt+0x80/0xa0\n\t[ 206.555525] </IRQ>\n\t[ 206.555527] <TASK>\n\t...\n\t[ 206.555650] RIP: 0010:dma_fence_signal_timestamp_locked+0x39/0xe0\n\t...\n\t[ 206.555667] Kernel panic - not syncing: Fatal exception in interrupt"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/amdgpu: Refactorizar amdgpu_gem_va_ioctl para el Manejo de la \u00daltima Actualizaci\u00f3n de Fence y la Gesti\u00f3n de la L\u00ednea de Tiempo v4\n\nEste commit simplifica la funci\u00f3n amdgpu_gem_va_ioctl, las actualizaciones clave incluyen:\n - Se movi\u00f3 la l\u00f3gica para gestionar la \u00faltima fence de actualizaci\u00f3n directamente a\n amdgpu_gem_va_update_vm.\n - Se introdujeron comprobaciones para el punto de la l\u00ednea de tiempo para permitir el reemplazo o la adici\u00f3n condicional de fences.\n\nv2: Se abordaron los comentarios de revisi\u00f3n de Christian.\nv3: Se actualizaron los comentarios (Christian).\nv4: La versi\u00f3n anterior seleccionaba la fence demasiado pronto y no gestionaba su\n referencia correctamente, lo que pod\u00eda llevar a que se utilizaran fences obsoletas o liberadas.\n Esto resultaba en subdesbordamientos de refcount y pod\u00eda provocar un fallo al actualizar las\n l\u00edneas de tiempo de la GPU.\n La fence ahora se elige solo despu\u00e9s de que se complete el trabajo de mapeo de VA, y su\n referencia se toma de forma segura. Despu\u00e9s de exportarla al syncobj de la l\u00ednea de tiempo de la VM, el\n controlador siempre libera su referencia local de la fence, asegurando un refcounting equilibrado\n y evitando el uso despu\u00e9s de liberaci\u00f3n en dma_fence.\n\n\tFirma del fallo:\n\t[ 205.828135] refcount_t: subdesbordamiento; uso despu\u00e9s de liberaci\u00f3n.\n\t[ 205.832963] ADVERTENCIA: CPU: 30 PID: 7274 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110\n\t...\n\t[ 206.074014] Ruta de Llamada:\n\t[ 206.076488] [TASK]\n\t[ 206.078608] amdgpu_gem_va_ioctl+0x6ea/0x740 [amdgpu]\n\t[ 206.084040] ? __pfx_amdgpu_gem_va_ioctl+0x10/0x10 [amdgpu]\n\t[ 206.089994] drm_ioctl_kernel+0x86/0xe0 [drm]\n\t[ 206.094415] drm_ioctl+0x26e/0x520 [drm]\n\t[ 206.098424] ? __pfx_amdgpu_gem_va_ioctl+0x10/0x10 [amdgpu]\n\t[ 206.104402] amdgpu_drm_ioctl+0x4b/0x80 [amdgpu]\n\t[ 206.109387] __x64_sys_ioctl+0x96/0xe0\n\t[ 206.113156] do_syscall_64+0x66/0x2d0\n\t...\n\t[ 206.553351] ERROR: incapaz de manejar fallo de p\u00e1gina para la direcci\u00f3n: ffffffffc0dfde90\n\t...\n\t[ 206.553378] RIP: 0010:dma_fence_signal_timestamp_locked+0x39/0xe0\n\t...\n\t[ 206.553405] Ruta de Llamada:\n\t[ 206.553409] [IRQ]\n\t[ 206.553415] ? __pfx_drm_sched_fence_free_rcu+0x10/0x10 [gpu_sched]\n\t[ 206.553424] dma_fence_signal+0x30/0x60\n\t[ 206.553427] drm_sched_job_done.isra.0+0x123/0x150 [gpu_sched]\n\t[ 206.553434] dma_fence_signal_timestamp_locked+0x6e/0xe0\n\t[ 206.553437] dma_fence_signal+0x30/0x60\n\t[ 206.553441] amdgpu_fence_process+0xd8/0x150 [amdgpu]\n\t[ 206.553854] sdma_v4_0_process_trap_irq+0x97/0xb0 [amdgpu]\n\t[ 206.554353] edac_mce_amd(E) ee1004(E)\n\t[ 206.554270] amdgpu_irq_dispatch+0x150/0x230 [amdgpu]\n\t[ 206.554702] amdgpu_ih_process+0x6a/0x180 [amdgpu]\n\t[ 206.555101] amdgpu_irq_handler+0x23/0x60 [amdgpu]\n\t[ 206.555500] __handle_irq_event_percpu+0x4a/0x1c0\n\t[ 206.555506] handle_irq_event+0x38/0x80\n\t[ 206.555509] handle_edge_irq+0x92/0x1e0\n\t[ 206.555513] __common_interrupt+0x3e/0xb0\n\t[ 206.555519] common_interrupt+0x80/0xa0\n\t[ 206.555525] [/IRQ]\n\t[ 206.555527] [TASK]\n\t...\n\t[ 206.555650] RIP: 0010:dma_fence_signal_timestamp_locked+0x39/0xe0\n\t...\n\t[ 206.555667] P\u00e1nico del kernel - no sincronizando: Excepci\u00f3n fatal en interrupci\u00f3n"}], "id": "CVE-2026-43237", "lastModified": "2026-11-11T20:10:00.273", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43237", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:15:58.192965Z", "version": "2.0.3"}}]}, "published": "2026-05-06T12:16:43.960", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0399b8416ecf64ef86ad23401fe23eabdb07831a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bd8150a1b3370a9f7761c5814202a3fe5a79f44f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e9e477d3197f7d8955a042c0d7f53f78f13218ba"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: drm/amdgpu: Refactor amdgpu_gem_va_ioctl for Handling Last Fence Update and Timeline Management v4", "id": "2467202", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467202"}, "csaw": false, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel's AMD GPU (amdgpu) driver. Incorrect management of graphics memory (dma_fence) references within the `amdgpu_gem_va_ioctl` function can lead to a reference count underflow and a use-after-after-free condition. A local attacker could exploit this vulnerability to trigger a kernel panic, causing the system to crash and resulting in a denial of service."], "name": "CVE-2026-43237", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43237\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43237\nhttps://lore.kernel.org/linux-cve-announce/2026050658-CVE-2026-43237-b6c1@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,e9e477d3197f7d8955a042c0d7f53f78f13218ba)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,0399b8416ecf64ef86ad23401fe23eabdb07831a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,bd8150a1b3370a9f7761c5814202a3fe5a79f44f)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.16,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.6,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-06T15:30:06.078053+00:00", "updated": "2026-05-12T22:15:25.296510+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}