SB20260812142 - Use-after-free in Linux kernel drm xe driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-68383)

CWE-ID: CWE-416 - Use After Free

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 use-after-free in the xe GuC scheduler timeline name handling when destroying an exec queue while scheduler fences still reference the timeline name. A local user can trigger exec queue destruction while outstanding scheduler fences still reference the freed name to cause a denial of service.

The issue arises because the scheduler keeps a pointer to the timeline name after the exec queue lifetime ends, creating an RCU-lifetime mismatch.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/299bc6d50b1bed7d1f408391736712f01a0855e2
• https://git.kernel.org/stable/c/77fd62412431e8c80ef2ad61466bc76fe425f80a