SB20260720354 - Race condition in Linux kernel gpu drm driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-63885)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

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

The vulnerability exists due to a race condition in drm_gem_change_handle_ioctl and drm_gem_handle_delete in the drm gem handle management code when handling concurrent handle change and handle delete operations. A local user can trigger concurrent operations on a stale handle reference to cause a denial of service.

The issue can result in the GEM object being freed while a new handle reference still points to it.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0dfa42cfe4dbe114533480503934f43e33c1e83d
• https://git.kernel.org/stable/c/7164d78559b0ff29931a366a840a9e5dd53d4b7c
• https://git.kernel.org/stable/c/cde2c9257cbe8463b9dcf7b1075177b72b5fd938