CVE-2026-63881

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Exploitation requires a local `ioctl()` on `/dev/kfd` via `AMDKFD_IOC_DBG_TRAP` with `KFD_IOC_DBG_TRAP_SUSPEND_QUEUES` or `KFD_IOC_DBG_TRAP_RESUME_QUEUES`; there is no network, adjacent-radio, or physical-access path to the vulnerable code.\nAC:L - On affected 32-bit `size_t` kernel builds, an attacker fully controls `num_queues` in the ioctl and can reliably force the multiply overflow (e.g. `num_queues >= 0x40000001`) to trigger undersized `memdup_user()` followed by unbounded kernel heap corruption.\nPR:L - A local unprivileged user with AMDGPU/KFD device access can open `/dev/kfd`, enable the debug runtime and debug trap on their own process (no ptrace or root required), then invoke suspend/resume with a malicious `num_queues` value.\nUI:N - Exploitation is achieved entirely through attacker-initiated ioctl calls in an established KFD debug session; no victim interaction is required.\nS:U - Impact is kernel heap corruption and potential local privilege escalation within the same kernel security boundary, not a cross-boundary escape such as VM guest-to-host or IOMMU bypass.\nC:H - The integer overflow causes a heap buffer far smaller than `num_queues`, and subsequent `q_array_get_index()`/`copy_to_user()` operations perform out-of-bounds kernel reads that can disclose adjacent heap memory and be leveraged for arbitrary read primitives.\nI:H - `q_array_invalidate()` and per-queue status updates write attacker-influenced values (`KFD_DBG_QUEUE_INVALID_MASK`/`KFD_DBG_QUEUE_ERROR_MASK`) far beyond the allocated buffer, constituting an out-of-bounds heap write exploitable for control-flow hijacking and arbitrary kernel modification.\nA:H - Writing billions of 32-bit values past a 4-byte kmalloc object corrupts adjacent kernel heap metadata and objects, readily causing kernel oops/panic and complete loss of availability even before full exploitation."}]}], "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/amdkfd/kfd_device_queue_manager.c"], "versions": [{"version": "a70a93fa568b4f05aba548dadb673703eccf5480", "lessThan": "4e5f808b454167cc58d7084a407a554d8ddc694d", "status": "affected", "versionType": "git"}, {"version": "a70a93fa568b4f05aba548dadb673703eccf5480", "lessThan": "de70a80992396ee306ee3a2810ad28aa1608ba9b", "status": "affected", "versionType": "git"}, {"version": "a70a93fa568b4f05aba548dadb673703eccf5480", "lessThan": "5cf4a41aa0d74e4c83f82d2ce233b5189ed4b43c", "status": "affected", "versionType": "git"}, {"version": "a70a93fa568b4f05aba548dadb673703eccf5480", "lessThan": "4f9eeedc3d3151f8a226fd676c314a813edda5a1", "status": "affected", "versionType": "git"}, {"version": "a70a93fa568b4f05aba548dadb673703eccf5480", "lessThan": "93f5534b35a05ef8a0109c1eefa800062fee810a", "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/amdkfd/kfd_device_queue_manager.c"], "versions": [{"version": "6.5", "status": "affected"}, {"version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.12", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.5", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.12.93"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.18.35"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.0.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4e5f808b454167cc58d7084a407a554d8ddc694d"}, {"url": "https://git.kernel.org/stable/c/de70a80992396ee306ee3a2810ad28aa1608ba9b"}, {"url": "https://git.kernel.org/stable/c/5cf4a41aa0d74e4c83f82d2ce233b5189ed4b43c"}, {"url": "https://git.kernel.org/stable/c/4f9eeedc3d3151f8a226fd676c314a813edda5a1"}, {"url": "https://git.kernel.org/stable/c/93f5534b35a05ef8a0109c1eefa800062fee810a"}], "title": "drm/amdkfd: fix a vulnerability of integer overflow in kfd debugger", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-63881", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:32:47.297110Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-190", "description": "CWE-190 Integer Overflow or Wraparound"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:17:54.018Z"}}]}}

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{"bugzilla": {"description": "kernel: drm/amdkfd: fix a vulnerability of integer overflow in kfd debugger", "id": "2502452", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502452"}, "csaw": false, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/amdkfd: fix a vulnerability of integer overflow in kfd debugger\nget_queue_ids() computes array_size = num_queues * sizeof(uint32_t),\nwhich could overflow on 32-bit size_t build. using array_size()\ninstead, it saturates to SIZE_MAX on overflow.\n(cherry picked from commit 2d57a0475f085c08b49312dfd8edcb461845f285)", "A flaw was found in the Linux kernel's AMD KFD (Kernel Fusion Driver) debugger component. The `get_queue_ids()` function, responsible for handling queue identifiers, contains an integer overflow vulnerability. This occurs when calculating the size of an array, where a malicious local user could provide a large number of queues, causing the size calculation to wrap around on 32-bit systems. This could lead to a heap buffer overflow, potentially resulting in a denial of service or, in certain scenarios, privilege escalation."], "name": "CVE-2026-63881", "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": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63881\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63881\nhttps://lore.kernel.org/linux-cve-announce/2026071939-CVE-2026-63881-5a86@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a70a93fa568b4f05aba548dadb673703eccf5480,4e5f808b454167cc58d7084a407a554d8ddc694d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a70a93fa568b4f05aba548dadb673703eccf5480,de70a80992396ee306ee3a2810ad28aa1608ba9b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a70a93fa568b4f05aba548dadb673703eccf5480,5cf4a41aa0d74e4c83f82d2ce233b5189ed4b43c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a70a93fa568b4f05aba548dadb673703eccf5480,4f9eeedc3d3151f8a226fd676c314a813edda5a1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a70a93fa568b4f05aba548dadb673703eccf5480,93f5534b35a05ef8a0109c1eefa800062fee810a)"}}], "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": "affected", "versions": {"scheme": "generic", "value": "6.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.5)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.143,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.93,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.35,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0.12,7.0.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "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": "2026-07-21T03:45:16.905782+00:00", "updated": "2026-10-20T08:45:07.975624+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-190", "CWE-787"]}