SB20260812252 - 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-2026-68279)

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

CVSSv4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to out-of-bounds read in drm_dp_sideband_parse_remote_dpcd_read() and drm_dp_sideband_parse_remote_i2c_read_ack() when parsing remote DPCD and I2C sideband reply messages from an MST hub. A remote attacker can send a specially crafted sideband reply with an oversized num_bytes value to disclose sensitive information.

The issue can be triggered by a malicious or misbehaving MST hub.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/04d953f50d61e542e94a5977822cc53735f8c0ce
• https://git.kernel.org/stable/c/1a8f537f5a1eeac941f262fe73078d6b08ba83c0
• https://git.kernel.org/stable/c/22d9f7fc1aaabaf73d5f30e8b0c9aa814ecd6ed2
• https://git.kernel.org/stable/c/533d9e2bede4aeefdc2a0561d7071cfede95958f
• https://git.kernel.org/stable/c/e6ef5455b06cb4e5d181aabcd723791587c79f12