CVE-2026-98391 is a vulnerability in Linux Kernel
Published on October 14, 2026
drm/xe: Guard page-fault worker with runtime PM check
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]
Products Associated with CVE-2026-98391
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Affected Versions
Linux:- Version f289f7807119128d4f9d59f34ac557549c7562e5 and below 25764620ec64c0142e2c87c41787f45540cf09ff is affected.
- Version f289f7807119128d4f9d59f34ac557549c7562e5 and below 20fce5b34b21a995839743b4917a1edd2fd503ba is affected.
- Version 6.19 is affected.
- Before 6.19 is unaffected.
- Version 7.2.7, <= 7.2.* is unaffected.
- Version 7.3-rc3, <= * is unaffected.