PT-2026-52234 · Linux · Linux

Publicado 2026-06-25 · Atualizado 2026-06-25 · CVE-2026-53138

Mitre

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)

Identificadores relacionados

CVE-2026-53138

Produtos afetados

Linux

Referências · 5

• https://git.kernel.org/stable/c/6173cfea2f916e01c4f98e29cd654384a05e32a3 · Nota
• https://git.kernel.org/stable/c/0e56f460bddb397fa9a8e6faf7ae7eaa86953eb1 · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-53138 · Nota de Segurança
• https://git.kernel.org/stable/c/2645e3caf7e013189da9c6ff621d006cca5a538b · Nota
• https://git.kernel.org/stable/c/ff287df16a1a58aca78b08d1f3ee09fc44da0351 · Nota