SB2026091786 - Improper update of reference count in Linux kernel mediatek mdp3 driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper update of reference count (CVE-ID: CVE-2026-89885)

CWE-ID: CWE-911 - Improper Update of Reference Count

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to compromise confidentiality, integrity, and availability.

The vulnerability exists due to improper reference count handling in the mtk-mdp3 mdp_probe() fallback SCP device lookup when the SCP handle lookup fails. A remote attacker can trigger the MDP device probe to compromise confidentiality, integrity, and availability.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0259ade4c4ceaf1e184a7c1aea8071ad398f9b6f
• https://git.kernel.org/stable/c/252850653569fdb1a259937e02325cf32c8f0970
• https://git.kernel.org/stable/c/55793e4665b7f15151e6f5ab51ca980e73abed5d
• https://git.kernel.org/stable/c/dce13bd9bade3ecc1acb7579397f24743850997f