drm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignment

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74447
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:49 UTC
Updated2026-08-17 06:19:40 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: fix uint32_t overflow in EOP ring buffer size alignment eop_ring_buffer_size in struct queue_properties is a u32. In kfd_queue_acquire_buffers() the expected EOP buffer size is computed as ALIGN(eop_ring_buffer_size, PAGE_SIZE); ALIGN uses typeof(x), so the addition is done in 32-bit. A user-supplied size of 0xFFFFF001 wraps to 0, causing kfd_queue_buffer_get() to skip its exact-size check (gated on size != 0) and accept any BO mapped at the address. On GFX8/GFX9 the MQD cp_hqd_eop_control is then programmed for an 8KB EOP ring backed by a 4KB BO, so CP EOP writes can land past the buffer and fault the GPU. Cast the operand to u64 so the alignment is computed in 64-bit; the size check in kfd_queue_buffer_get() then rejects the oversized request. (cherry picked from commit ae443117b742c357bfef3a7bddabf76fcf86e9ef)

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001290000 probability, percentile 0.029440000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ee0dc6c66a913260311876a4b2b53fe0b9bc3f94 273548eb997c6be85230c1236b18784b09f6203c git Not specified
CNA Linux Linux affected acfc84cfa70aca5b970faf152979bc97b9f8b0c0 6dc0b4b39ed4f11ef70f76ecea8537e35f45342b git Not specified
CNA Linux Linux affected 42ea9cf2f16b7131cb7302acb3dac510968f8bdc 7c54bd225d83bc1bcb44430ed4b4d3a5c36b1961 git Not specified
CNA Linux Linux affected 42ea9cf2f16b7131cb7302acb3dac510968f8bdc 83463a96ea3c7d8ae636a4d6a0ba63c9ce410724 git Not specified
CNA Linux Linux affected c6ce687077cc67e4f3cbd0c89cb356fbbce91f4c git Not specified
CNA Linux Linux affected 6.12.75 6.12.103 semver Not specified
CNA Linux Linux affected 6.18.16 6.18.44 semver Not specified
CNA Linux Linux affected 6.19.6 6.20 semver Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/83463a96ea3c7d8ae636a4d6a0ba63c9ce410724 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/273548eb997c6be85230c1236b18784b09f6203c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7c54bd225d83bc1bcb44430ed4b4d3a5c36b1961 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6dc0b4b39ed4f11ef70f76ecea8537e35f45342b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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