SB2026081659 - Improper Check for Unusual or Exceptional Conditions in Linux kernel gpu drm driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-72313)

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

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

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

The vulnerability exists due to improper handling of CRTC selection in drm fb-helper when synchronizing fbdev output to vblank. A local user can trigger display update handling on a system where fbdev output is not on the selected CRTC to cause a denial of service.

The issue can result in vblank wait timeouts and kernel warnings when fbdev output is not on CRTC 0.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/06c2b8d7ea2bcb014dd974fc3bc6d128d65d7477
• https://git.kernel.org/stable/c/7d84acf641afb68aa8efe40815ef43779ddb12fd