---
id: CVE-2025-40340
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/xe: Fix oops in xe_gem_fault when running core_hotunplug test.

  I saw an oops in xe_gem_fault when running the xe-fast-feedback
  testlist against the realtime kernel…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/xe: Fix oops in xe_gem_fault when running core_hotunplug test.

  I saw an oops in xe_gem_fault when running the xe-fast-feedback
  testlist against the realtime kernel…
severity: none
published: '2025-12-09'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T22:10:00.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-40340'
references:
  - url: 'https://git.kernel.org/stable/c/1cda3c755bb7770be07d75949bb0f45fb88651f6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/29a3064f9c5a908aaf0b39cd6ed30374db11840d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/99428bd6123d5676209dfb1d7a8f176cc830b665'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00219
epssPercentile: 0.1149
ingestedAt: '2026-10-14T23:00:02.033Z'
---

## Overview

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

drm/xe: Fix oops in xe_gem_fault when running core_hotunplug test.

I saw an oops in xe_gem_fault when running the xe-fast-feedback
testlist against the realtime kernel without debug options enabled.

The panic happens after core_hotunplug unbind-rebind finishes.
Presumably what happens is that a process mmaps, unlocks because
of the FAULT_FLAG_RETRY_NOWAIT logic, has no process memory left,
causing ttm_bo_vm_dummy_page() to return VM_FAULT_NOPAGE, since
there was nothing left to populate, and then oopses in
"mem_type_is_vram(tbo->resource->mem_type)" because tbo->resource
is NULL.

It's convoluted, but fits the data and explains the oops after
the test exits.

## Remediation

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