{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-63881", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.018Z", "datePublished": "2026-07-19T14:54:53.676Z", "dateUpdated": "2026-08-05T12:36:51.042Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:36:51.042Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: fix a vulnerability of integer overflow in kfd debugger\n\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\n(cherry picked from commit 2d57a0475f085c08b49312dfd8edcb461845f285)" } ], "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 - 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" } } } }