SB20261015147 - Race condition in Linux kernel drm xe driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-98391)

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

CVSSv4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to trigger a kernel warning.

The vulnerability exists due to a race condition in the Xe DRM driver's page-fault queue worker when acknowledging stale page faults after VM teardown and device autosuspend. A local user can initiate VM teardown while page faults remain queued to trigger a kernel warning.

The warning occurs when guc_ct_send_locked() accesses an already-suspended device and the runtime power-management assertion fails.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/20fce5b34b21a995839743b4917a1edd2fd503ba
• https://git.kernel.org/stable/c/25764620ec64c0142e2c87c41787f45540cf09ff