---
id: CVE-2026-98391
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/xe: Guard page-fault worker with runtime PM check

  During VM teardown, the VM's runtime PM reference is dropped
  asynchronously, allowing the device to autosuspend w…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/xe: Guard page-fault worker with runtime PM check

  During VM teardown, the VM's runtime PM reference is dropped
  asynchronously, allowing the device to autosuspend w…
severity: none
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T14:17:49.980'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98391'
references:
  - url: 'https://git.kernel.org/stable/c/20fce5b34b21a995839743b4917a1edd2fd503ba'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/25764620ec64c0142e2c87c41787f45540cf09ff'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
ingestedAt: '2026-10-14T15:36:13.977Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

drm/xe: Guard page-fault worker with runtime PM check

During VM teardown, the VM's runtime PM reference is dropped
asynchronously, allowing the device to autosuspend while stale page
faults belonging to the now-dead VM are still queued. When the
page-fault worker later tries to ack one of these, it calls into
guc_ct_send_locked() on an already-suspended device, tripping:

  Assertion `!xe_pm_runtime_suspended(xe)` failed!
  WARNING at xe_device.c:1267 xe_device_assert_mem_access+0x11c/0x140 [xe]

A live VM/exec queue always holds a PM reference while it has
outstanding work, so if the device is suspended at ack time, the
owning context is already gone and the fault is stale.

Take a runtime PM reference across the entire pagefault
queue worker to safely deliver acks for torn-down VMs.

v3:
 - Move PM ref to the generic xe_pagefault_queue_work using
   guard(xe_pm_runtime)(xe) instead of tracking it in the GuC
   backend(Matt Brost).

v2:
 - Hold PM ref across the entire batch (begin/end) instead of per-ack.
   This prevents the device from autosuspending mid-batch, which would
   leave write_only acks written but the end flush skipped, and skip
   counter++, desyncing the cadence check.(Himal)
 - Add a comment explaining stale faults.(Himal)

(cherry picked from commit fcc2431d2213dc4d04250c4f1ae87d9c3ae0d455)
[Rodrigo: Added xe_device struct for compatibility while cherry-picking]

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.