SB20260626202 - Out-of-bounds read in Linux kernel dc bios driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-53138)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows an attacker with physical access to cause a denial of service or disclose sensitive information.

The vulnerability exists due to an out-of-bounds read and unbounded iteration in amd display bios_parser.c and bios_parser2.c record-chain walk loops when parsing a malformed VBIOS image during probe time. An attacker with physical access can provide a crafted VBIOS image missing the terminator record to cause a denial of service or disclose sensitive information.

The issue is triggered when the VBIOS record chain lacks the 0xFF terminator record or uses a zero-sized termination condition incorrectly.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0e56f460bddb397fa9a8e6faf7ae7eaa86953eb1
• https://git.kernel.org/stable/c/2645e3caf7e013189da9c6ff621d006cca5a538b
• https://git.kernel.org/stable/c/6173cfea2f916e01c4f98e29cd654384a05e32a3
• https://git.kernel.org/stable/c/ff287df16a1a58aca78b08d1f3ee09fc44da0351