drm/vmwgfx: bound DMA command body size against suffix pointer

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74443
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:48 UTC
Updated2026-08-19 17:21:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: bound DMA command body size against suffix pointer vmw_cmd_dma() locates the DMA suffix at (unsigned long) &cmd->body + header->size - sizeof(*suffix) without checking that header->size is large enough to contain both cmd->body and the suffix. An undersized header makes the suffix pointer underflow back into the previous command in the bounce buffer. The verifier later writes suffix->maximumOffset, clobbering verified fields of an already-relocated earlier command -- a TOCTOU on the device-visible command stream that lets one command rewrite another's GMR id, surface id, or other authenticated fields. Reject the command if the body is too small for the suffix to fit.

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: 0.001290000 probability, percentile 0.029470000 (date 2026-08-19)

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 4e4ddd47774313accc86b233d6ca2c6a9037a671 eb20f418933bea53375843b27b4022c1810be63b git Not specified
CNA Linux Linux affected 4e4ddd47774313accc86b233d6ca2c6a9037a671 fcd1e56e7816b31a1050ccc67df722b20f6bb15d git Not specified
CNA Linux Linux affected 4e4ddd47774313accc86b233d6ca2c6a9037a671 a4a37080a5ac777b59306cfcdf854cc05d7604d4 git Not specified
CNA Linux Linux affected 4e4ddd47774313accc86b233d6ca2c6a9037a671 036e16ada95389bdc30f41068af04c1d0872fad0 git Not specified
CNA Linux Linux affected 4e4ddd47774313accc86b233d6ca2c6a9037a671 d5d7ada4e1296b00d89fe82b2ca850cc7809d6f7 git Not specified
CNA Linux Linux affected 4e4ddd47774313accc86b233d6ca2c6a9037a671 7e40e6120fb232a10b543ffd994e5c6d8f3a2cc6 git Not specified
CNA Linux Linux affected 4e4ddd47774313accc86b233d6ca2c6a9037a671 9759da60e38d7b9db44dc92713e4e0391883d221 git Not specified
CNA Linux Linux affected 4e4ddd47774313accc86b233d6ca2c6a9037a671 f4f1db96bfd68b81053693ba53405b6f510ac16c git Not specified
CNA Linux Linux affected 2.6.33 Not specified
CNA Linux Linux unaffected 2.6.33 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* 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/f4f1db96bfd68b81053693ba53405b6f510ac16c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eb20f418933bea53375843b27b4022c1810be63b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7e40e6120fb232a10b543ffd994e5c6d8f3a2cc6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d5d7ada4e1296b00d89fe82b2ca850cc7809d6f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/036e16ada95389bdc30f41068af04c1d0872fad0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9759da60e38d7b9db44dc92713e4e0391883d221 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fcd1e56e7816b31a1050ccc67df722b20f6bb15d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a4a37080a5ac777b59306cfcdf854cc05d7604d4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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