CVE-2026-53138

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

State: Published
Severity: Not scored
Published: Jun 25, 2026
Updated: Jul 4, 2026
Reserved: Jun 9, 2026

Description

In 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)

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before e94f5323c41f32a74160378c3b19850d1f203ad5Affected 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before 04e271a952b8863bbafc99bd51aca4c32bff0e0dAffected 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before 6723188c42ca3b34a9fce634d7a0ecc9ccd5cd56Affected 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before 499c6b43a79dd684bddbd18fe8b2235aa2764db4Affected 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before 6173cfea2f916e01c4f98e29cd654384a05e32a3Affected 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before 0e56f460bddb397fa9a8e6faf7ae7eaa86953eb1Affected 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before 2645e3caf7e013189da9c6ff621d006cca5a538bAffected 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before ff287df16a1a58aca78b08d1f3ee09fc44da0351Affected
LinuxLinux	4.15Affected before 4.15Not affected 5.10.260 through 5.10.Not affected 5.15.211 through 5.15.Not affected 6.1.177 through 6.1.Not affected 6.6.144 through 6.6.Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before e94f5323c41f32a74160378c3b19850d1f203ad5Affected
4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before 04e271a952b8863bbafc99bd51aca4c32bff0e0dAffected
4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before 6723188c42ca3b34a9fce634d7a0ecc9ccd5cd56Affected
4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before 499c6b43a79dd684bddbd18fe8b2235aa2764db4Affected
4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before 6173cfea2f916e01c4f98e29cd654384a05e32a3Affected
4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before 0e56f460bddb397fa9a8e6faf7ae7eaa86953eb1Affected
4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before 2645e3caf7e013189da9c6ff621d006cca5a538bAffected
4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c to before ff287df16a1a58aca78b08d1f3ee09fc44da0351Affected

LinuxLinux

4.15Affected
before 4.15Not affected
5.10.260 through 5.10.*Not affected
5.15.211 through 5.15.*Not affected
6.1.177 through 6.1.*Not affected
6.6.144 through 6.6.*Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

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