SB2026051464 - Improper Initialization in Linux kernel i915 display driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Initialization (CVE-ID: CVE-2026-43477)

CWE-ID: CWE-665 - Improper Initialization

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

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper hardware register initialization order in the i915 VRR timing configuration logic when handling failed display link training. A local user can trigger display configuration involving VRR after a link training failure to cause a denial of service.

The issue was observed on ICL systems with an external display connected through a dock using a faulty type-C cable, while TGL systems appeared unaffected.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/237aab549676288d9255bb8dcc284738e56eaa31
• https://git.kernel.org/stable/c/8a7d29b8bda144d44e61df1b2705b1d4378f4e44
• https://git.kernel.org/stable/c/bf9e3b6ffd76da38dd4961c65d80571b25bf10a5