drm/amd/display: Bound VBIOS record-chain walk loops

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Summary

CVECVE-2026-53138
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:31 UTC
Updated2026-06-25 09:16:31 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Bound VBIOS record-chain walk loops [Why & How] All record-chain walk loops in bios_parser.c and bios_parser2.c use for(;;) and only terminate on a 0xFF record_type sentinel or zero record_size. A malformed VBIOS image missing the terminator record causes unbounded iteration at probe time, potentially hundreds of thousands of iterations with record_size=1. In the final iterations near the BIOS image boundary, struct casts beyond the 2-byte header validated by GET_IMAGE can also read out of bounds. Cap all 14 record-chain walk loops to BIOS_MAX_NUM_RECORD (256) iterations. The atombios.h defines up to 22 distinct record types and atomfirmware.h has 13. Assuming an average of less than 10 records per type (which is reasonable since most are connector- based) 256 is a generous upper bound. (cherry picked from commit 95700a3d660287ed657d6892f7be9ffc0e294a93)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c 6173cfea2f916e01c4f98e29cd654384a05e32a3 git Not specified
CNA Linux Linux affected 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c 0e56f460bddb397fa9a8e6faf7ae7eaa86953eb1 git Not specified
CNA Linux Linux affected 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c 2645e3caf7e013189da9c6ff621d006cca5a538b git Not specified
CNA Linux Linux affected 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c ff287df16a1a58aca78b08d1f3ee09fc44da0351 git Not specified
CNA Linux Linux affected 4.15 Not specified
CNA Linux Linux unaffected 4.15 semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0e56f460bddb397fa9a8e6faf7ae7eaa86953eb1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ff287df16a1a58aca78b08d1f3ee09fc44da0351 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2645e3caf7e013189da9c6ff621d006cca5a538b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6173cfea2f916e01c4f98e29cd654384a05e32a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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