Bug 2492732 (CVE-2026-53138)

Summary: CVE-2026-53138 kernel: drm/amd/display: Bound VBIOS record-chain walk loops
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's AMD display (drm/amd/display) driver. A malformed VBIOS image can cause unbounded processing loops, leading to an out-of-bounds read. This could result in information disclosure or a system crash.
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Description OSIDB Bzimport 2026-06-25 10:02:50 UTC 
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)
Comment 1 TEJ RATHI 2026-06-26 07:19:45 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062543-CVE-2026-53138-59f9@gregkh/T