Out-of-bounds read in Linux kernel - CVE-2026-53138
Published: June 26, 2026
Vulnerability identifier: #VU135642
CSH Severity: Medium
CVSS v4.0: 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
CVE-ID: CVE-2026-53138
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-53138
Install security update from vendor's repository.