Race condition in Linux kernel - CVE-2026-98391

Vulnerability identifier: #VU155936

CSH Severity: Low

CVSS v4: 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]

CVE-ID: CVE-2026-98391

CWE-ID: CWE-362

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

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

• Race condition in Linux kernel drm xe driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more