{"api_version":"1","generated_at":"2026-09-03T05:16:04+00:00","cve":"CVE-2026-74447","urls":{"html":"https://cve.report/CVE-2026-74447","api":"https://cve.report/api/cve/CVE-2026-74447.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74447","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74447"},"summary":{"title":"drm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignment","description":"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)","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:17:49","updated_at":"2026-08-17 06:19:40"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"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","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/83463a96ea3c7d8ae636a4d6a0ba63c9ce410724","name":"https://git.kernel.org/stable/c/83463a96ea3c7d8ae636a4d6a0ba63c9ce410724","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/273548eb997c6be85230c1236b18784b09f6203c","name":"https://git.kernel.org/stable/c/273548eb997c6be85230c1236b18784b09f6203c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7c54bd225d83bc1bcb44430ed4b4d3a5c36b1961","name":"https://git.kernel.org/stable/c/7c54bd225d83bc1bcb44430ed4b4d3a5c36b1961","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6dc0b4b39ed4f11ef70f76ecea8537e35f45342b","name":"https://git.kernel.org/stable/c/6dc0b4b39ed4f11ef70f76ecea8537e35f45342b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74447","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74447","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ee0dc6c66a913260311876a4b2b53fe0b9bc3f94 273548eb997c6be85230c1236b18784b09f6203c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected acfc84cfa70aca5b970faf152979bc97b9f8b0c0 6dc0b4b39ed4f11ef70f76ecea8537e35f45342b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 42ea9cf2f16b7131cb7302acb3dac510968f8bdc 7c54bd225d83bc1bcb44430ed4b4d3a5c36b1961 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 42ea9cf2f16b7131cb7302acb3dac510968f8bdc 83463a96ea3c7d8ae636a4d6a0ba63c9ce410724 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74447","cve":"CVE-2026-74447","epss":"0.001290000","percentile":"0.029440000","score_date":"2026-08-17","updated_at":"2026-08-18 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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)"}],"metrics":[{"cvssV3_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","version":"3.1"},"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."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:47:18.735Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74447","datePublished":"2026-08-15T12:26:53.305Z","dateReserved":"2026-08-15T05:44:03.898Z","dateUpdated":"2026-08-17T05:47:18.735Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:17:49","lastModifiedDate":"2026-08-17 06:19:40","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74447","Ordinal":"1","Title":"drm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignm","CVE":"CVE-2026-74447","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74447","Ordinal":"1","NoteData":"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)","Type":"Description","Title":"drm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignm"}]}}}