drm/amdgpu: reject oversized IBs with per-ring packet limits

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80576
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-26 15:17:13 UTC
Updated2026-08-27 06:17:43 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: reject oversized IBs with per-ring packet limits On GFX rings, amdgpu_cs_p2_ib() passed user-supplied ib_bytes through to ib->length_dw without a limit, while ring_emit_ib() encodes length into packet fields. Oversized values can corrupt adjacent control bits and destabilize command submission. Add a per-ring IB packet size limit helper and reject command submissions exceeding the corresponding dword limit before IB allocation. Use the documented 20-bit limit for GFX/compute/SDMA/VPE, and apply the MM fallback limit for other ring types. (cherry picked from commit 7f48fa2cf62e3fa6c9c3870aa74988f773247e52)

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001200000 probability, percentile 0.020210000 (date 2026-08-27)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d38ceaf99ed015f2a0b9af3499791bd3a3daae21 6e164ba1057175fb8a370d8e05cbff5c57eac0c8 git Not specified
CNA Linux Linux affected d38ceaf99ed015f2a0b9af3499791bd3a3daae21 1474f3970d1afd303e12ff14d06808eabb371576 git Not specified
CNA Linux Linux affected d38ceaf99ed015f2a0b9af3499791bd3a3daae21 07fe270ec07c138a70afe7a81e115a85c35c545c git Not specified
CNA Linux Linux affected d38ceaf99ed015f2a0b9af3499791bd3a3daae21 fd37f9dd5b5ab70a46fa7bc76623c0528d602b27 git Not specified
CNA Linux Linux affected 4.2 Not specified
CNA Linux Linux unaffected 4.2 semver Not specified
CNA Linux Linux unaffected 6.12.105 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.46 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.10 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fd37f9dd5b5ab70a46fa7bc76623c0528d602b27 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6e164ba1057175fb8a370d8e05cbff5c57eac0c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1474f3970d1afd303e12ff14d06808eabb371576 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/07fe270ec07c138a70afe7a81e115a85c35c545c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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