SB20260812266 - Out-of-bounds read in Linux kernel drm display driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-68277)

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

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in the sideband reply parsers in drm_dp_mst_topology.c when parsing crafted sideband reply messages. A local user can provide a crafted message with a truncated 2-byte field to disclose sensitive information.

The out-of-bounds read can access data from adjacent struct fields including curchunk_len, curchunk_idx, and curlen.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0bcd7675c69a2462a8531fcd9e4d096e9c7ec5df
• https://git.kernel.org/stable/c/68a624416d1dd481b3e5b7ea0e8a070a9b8a2c73
• https://git.kernel.org/stable/c/6b89ba3dba2f583626fb693e47e951ffb8bf591f
• https://git.kernel.org/stable/c/bdf0508b1e6785d4a8982c637e97e68d60b47d7b
• https://git.kernel.org/stable/c/d5c70523cafa26ad2c7a37b612849abe2683baa8