CVE-2026-74447

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A user-supplied size of 0xFFFFF001 wraps to\n0, causing kfd_queue_buffer_get() to skip its exact-size check (gated on\nsize != 0) and accept any BO mapped at the address. On GFX8/GFX9 the MQD\ncp_hqd_eop_control is then programmed for an 8KB EOP ring backed by a 4KB\nBO, so CP EOP writes can land past the buffer and fault the GPU.\n\nCast the operand to u64 so the alignment is computed in 64-bit; the size\ncheck in kfd_queue_buffer_get() then rejects the oversized request.\n\n(cherry picked from commit ae443117b742c357bfef3a7bddabf76fcf86e9ef)"}], "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 local ioctl access to /dev/kfd (KFD_IOC_CREATE_QUEUE) after opening the AMDGPU render node; there is no network, adjacent-wireless, or physical-device path to the vulnerable kfd_queue_acquire_buffers() code.\nAC:L - An attacker who can open /dev/kfd and map GPU buffers can reliably bypass the EOP size check with eop_buffer_size=0xFFFFF001 (32-bit ALIGN wraps to 0) and trigger CP EOP writes by submitting compute work on the created queue.\nPR:L - Only a local unprivileged user with AMDGPU/KFD access (typically membership in the render group for /dev/dri/renderD* and /dev/kfd) is required; no real-root or init-namespace capabilities are needed.\nUI:N - No victim interaction is required; the attacker drives the full chain via their own KFD and DRM file descriptors, GPU memory mappings, and queue submission.\nS:U - The bug corrupts GPU virtual memory within the attacker's own process VMID and can fault or reset the shared GPU; it does not cross a VM/host, IOMMU, or sandbox security boundary into another authority.\nC:H - CP hardware performs out-of-bounds EOP writes up to 8KB into a 4KB backing object, corrupting adjacent GPU-mapped memory that can be read back or chained into further memory disclosure primitives.\nI:H - The MQD is programmed with an 8KB EOP ring while only a 4KB buffer is validated, causing the GPU command processor to write attacker-triggered data past the buffer end into adjacent GPU mappings.\nA:H - EOP writes beyond the undersized buffer cause GPU VM faults that can hang the device and schedule amdgpu_amdkfd_gpu_reset(), denying GPU service to all co-located workloads on shared cloud/HPC/desktop GPUs."}]}], "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_queue.c"], "versions": [{"version": "ee0dc6c66a913260311876a4b2b53fe0b9bc3f94", "lessThan": "273548eb997c6be85230c1236b18784b09f6203c", "status": "affected", "versionType": "git"}, {"version": "acfc84cfa70aca5b970faf152979bc97b9f8b0c0", "lessThan": "6dc0b4b39ed4f11ef70f76ecea8537e35f45342b", "status": "affected", "versionType": "git"}, {"version": "42ea9cf2f16b7131cb7302acb3dac510968f8bdc", "lessThan": "7c54bd225d83bc1bcb44430ed4b4d3a5c36b1961", "status": "affected", "versionType": "git"}, {"version": "42ea9cf2f16b7131cb7302acb3dac510968f8bdc", "lessThan": "83463a96ea3c7d8ae636a4d6a0ba63c9ce410724", "status": "affected", "versionType": "git"}, {"version": "c6ce687077cc67e4f3cbd0c89cb356fbbce91f4c", "status": "affected", "versionType": "git"}, {"version": "6.12.75", "lessThan": "6.12.103", "status": "affected", "versionType": "semver"}, {"version": "6.18.16", "lessThan": "6.18.44", "status": "affected", "versionType": "semver"}, {"version": "6.19.6", "lessThan": "6.20", "status": "affected", "versionType": "semver"}]}, {"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_queue.c"], "versions": [{"version": "7.0", "status": "affected"}, {"version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.12.75", "versionEndExcluding": "6.12.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.16", "versionEndExcluding": "6.18.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.6"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/273548eb997c6be85230c1236b18784b09f6203c"}, {"url": "https://git.kernel.org/stable/c/6dc0b4b39ed4f11ef70f76ecea8537e35f45342b"}, {"url": "https://git.kernel.org/stable/c/7c54bd225d83bc1bcb44430ed4b4d3a5c36b1961"}, {"url": "https://git.kernel.org/stable/c/83463a96ea3c7d8ae636a4d6a0ba63c9ce410724"}], "title": "drm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignment", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74447", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:56:43.690802Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:46.230Z"}}]}}

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no real-root or init-namespace capabilities are needed.\nUI:N - No victim interaction is required; the attacker drives the full chain via their own KFD and DRM file descriptors, GPU memory mappings, and queue submission.\nS:U - The bug corrupts GPU virtual memory within the attacker's own process VMID and can fault or reset the shared GPU; it does not cross a VM/host, IOMMU, or sandbox security boundary into another authority.\nC:H - CP hardware performs out-of-bounds EOP writes up to 8KB into a 4KB backing object, corrupting adjacent GPU-mapped memory that can be read back or chained into further memory disclosure primitives.\nI:H - The MQD is programmed with an 8KB EOP ring while only a 4KB buffer is validated, causing the GPU command processor to write attacker-triggered data past the buffer end into adjacent GPU mappings.\nA:H - EOP writes beyond the undersized buffer cause GPU VM faults that can hang the device and schedule amdgpu_amdkfd_gpu_reset(), denying GPU service to all co-located workloads on shared cloud/HPC/desktop GPUs."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "ee0dc6c66a913260311876a4b2b53fe0b9bc3f94", "lessThan": "273548eb997c6be85230c1236b18784b09f6203c", "versionType": "git"}, {"status": "affected", "version": "acfc84cfa70aca5b970faf152979bc97b9f8b0c0", "lessThan": "6dc0b4b39ed4f11ef70f76ecea8537e35f45342b", "versionType": "git"}, {"status": "affected", "version": "42ea9cf2f16b7131cb7302acb3dac510968f8bdc", "lessThan": "7c54bd225d83bc1bcb44430ed4b4d3a5c36b1961", "versionType": "git"}, {"status": "affected", "version": "42ea9cf2f16b7131cb7302acb3dac510968f8bdc", "lessThan": "83463a96ea3c7d8ae636a4d6a0ba63c9ce410724", "versionType": "git"}, {"status": "affected", "version": "c6ce687077cc67e4f3cbd0c89cb356fbbce91f4c", "versionType": "git"}, {"status": "affected", "version": "6.12.75", "lessThan": "6.12.103", "versionType": "semver"}, {"status": "affected", "version": "6.18.16", "lessThan": "6.18.44", "versionType": "semver"}, {"status": "affected", "version": "6.19.6", "lessThan": "6.20", "versionType": "semver"}], "programFiles": ["drivers/gpu/drm/amd/amdkfd/kfd_queue.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "7.0"}, {"status": "unaffected", "version": "0", "lessThan": "7.0", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.103", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.44", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.8", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/gpu/drm/amd/amdkfd/kfd_queue.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/273548eb997c6be85230c1236b18784b09f6203c"}, {"url": "https://git.kernel.org/stable/c/6dc0b4b39ed4f11ef70f76ecea8537e35f45342b"}, {"url": "https://git.kernel.org/stable/c/7c54bd225d83bc1bcb44430ed4b4d3a5c36b1961"}, {"url": "https://git.kernel.org/stable/c/83463a96ea3c7d8ae636a4d6a0ba63c9ce410724"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignment\n\neop_ring_buffer_size in struct queue_properties is a u32. 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/gpu/drm/amd/amdkfd/kfd_queue.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "273548eb997c6be85230c1236b18784b09f6203c", "status": "affected", "version": "ee0dc6c66a913260311876a4b2b53fe0b9bc3f94", "versionType": "git"}, {"lessThan": "6dc0b4b39ed4f11ef70f76ecea8537e35f45342b", "status": "affected", "version": "acfc84cfa70aca5b970faf152979bc97b9f8b0c0", "versionType": "git"}, {"lessThan": "7c54bd225d83bc1bcb44430ed4b4d3a5c36b1961", "status": "affected", "version": "42ea9cf2f16b7131cb7302acb3dac510968f8bdc", "versionType": "git"}, {"lessThan": "83463a96ea3c7d8ae636a4d6a0ba63c9ce410724", "status": "affected", "version": "42ea9cf2f16b7131cb7302acb3dac510968f8bdc", "versionType": "git"}, {"status": "affected", "version": "c6ce687077cc67e4f3cbd0c89cb356fbbce91f4c", "versionType": "git"}, {"lessThan": "6.12.103", "status": "affected", "version": "6.12.75", "versionType": "semver"}, {"lessThan": "6.18.44", "status": "affected", "version": "6.18.16", "versionType": "semver"}, {"lessThan": "6.20", "status": "affected", "version": "6.19.6", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/gpu/drm/amd/amdkfd/kfd_queue.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.0"}, {"lessThan": "7.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.103", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.44", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignment\n\neop_ring_buffer_size in struct queue_properties is a u32. In\nkfd_queue_acquire_buffers() the expected EOP buffer size is computed as\nALIGN(eop_ring_buffer_size, PAGE_SIZE); ALIGN uses typeof(x), so the\naddition is done in 32-bit. A user-supplied size of 0xFFFFF001 wraps to\n0, causing kfd_queue_buffer_get() to skip its exact-size check (gated on\nsize != 0) and accept any BO mapped at the address. On GFX8/GFX9 the MQD\ncp_hqd_eop_control is then programmed for an 8KB EOP ring backed by a 4KB\nBO, so CP EOP writes can land past the buffer and fault the GPU.\n\nCast the operand to u64 so the alignment is computed in 64-bit; the size\ncheck in kfd_queue_buffer_get() then rejects the oversized request.\n\n(cherry picked from commit ae443117b742c357bfef3a7bddabf76fcf86e9ef)"}], "id": "CVE-2026-74447", "lastModified": "2026-10-16T20:17:28.420", "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-2026-74447", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:56:43.690802Z", "version": "2.0.3"}}]}, "published": "2026-08-15T13:17:49.287", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/273548eb997c6be85230c1236b18784b09f6203c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6dc0b4b39ed4f11ef70f76ecea8537e35f45342b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7c54bd225d83bc1bcb44430ed4b4d3a5c36b1961"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/83463a96ea3c7d8ae636a4d6a0ba63c9ce410724"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: drm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignment", "id": "2516979", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516979"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignment\neop_ring_buffer_size in struct queue_properties is a u32. In\nkfd_queue_acquire_buffers() the expected EOP buffer size is computed as\nALIGN(eop_ring_buffer_size, PAGE_SIZE); ALIGN uses typeof(x), so the\naddition is done in 32-bit. A user-supplied size of 0xFFFFF001 wraps to\n0, causing kfd_queue_buffer_get() to skip its exact-size check (gated on\nsize != 0) and accept any BO mapped at the address. On GFX8/GFX9 the MQD\ncp_hqd_eop_control is then programmed for an 8KB EOP ring backed by a 4KB\nBO, so CP EOP writes can land past the buffer and fault the GPU.\nCast the operand to u64 so the alignment is computed in 64-bit; the size\ncheck in kfd_queue_buffer_get() then rejects the oversized request.\n(cherry picked from commit ae443117b742c357bfef3a7bddabf76fcf86e9ef)", "A flaw was found in the Linux kernel's `drm/amdkfd` component. An integer overflow vulnerability exists when aligning the End-of-Pipe (EOP) ring buffer size. A local attacker could exploit this by providing a specially crafted size that, due to a 32-bit integer overflow, causes the system to bypass buffer size checks. This could lead to writes beyond the intended buffer, potentially causing a Graphics Processing Unit (GPU) fault and resulting in a Denial of Service (DoS)."], "name": "CVE-2026-74447", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74447\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74447\nhttps://lore.kernel.org/linux-cve-announce/2026081530-CVE-2026-74447-c47e@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ee0dc6c66a913260311876a4b2b53fe0b9bc3f94,273548eb997c6be85230c1236b18784b09f6203c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[acfc84cfa70aca5b970faf152979bc97b9f8b0c0,6dc0b4b39ed4f11ef70f76ecea8537e35f45342b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[42ea9cf2f16b7131cb7302acb3dac510968f8bdc,7c54bd225d83bc1bcb44430ed4b4d3a5c36b1961)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[42ea9cf2f16b7131cb7302acb3dac510968f8bdc,83463a96ea3c7d8ae636a4d6a0ba63c9ce410724)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "c6ce687077cc67e4f3cbd0c89cb356fbbce91f4c"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.75,6.12.103)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.16,6.18.44)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.19.6,6.20)"}}], "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": "7.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.103,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.44,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.8,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc6,*]"}}], "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": "2026-08-15T16:00:07.795211+00:00", "updated": "2026-08-21T23:30:17.185032+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}