---
id: CVE-2026-98510
title: 'drm/xe/vm: nuke PTs only after unlinking contested VMAs'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/xe/vm: nuke PTs only after unlinking contested VMAs

  In xe_vm_close_and_put(), external-BO VMAs are queued on the contested
  list for deferred destruction via xe_vma…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc <
    70fddc065ac80845ffd33095b3635d59883cf7e6
  - >-
    Linux >= b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc <
    ba678c2b02e0d36b53deb5a6d5e5ea044d36def7
  - >-
    Linux >= b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc <
    bddaa5e4094c134452c29e20a26c4718827e4cb1
  - >-
    Linux >= b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc <
    24a22fb3c731474b68e986af6804db450fb88617
  - Linux 6.8
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:17:20.805Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98510'
references:
  - url: 'https://git.kernel.org/stable/c/70fddc065ac80845ffd33095b3635d59883cf7e6'
  - url: 'https://git.kernel.org/stable/c/ba678c2b02e0d36b53deb5a6d5e5ea044d36def7'
  - url: 'https://git.kernel.org/stable/c/bddaa5e4094c134452c29e20a26c4718827e4cb1'
  - url: 'https://git.kernel.org/stable/c/24a22fb3c731474b68e986af6804db450fb88617'
tags:
  - cve.org
ingestedAt: '2026-10-18T15:45:12.285Z'
---

## Overview

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

drm/xe/vm: nuke PTs only after unlinking contested VMAs

In xe_vm_close_and_put(), external-BO VMAs are queued on the contested
list for deferred destruction via xe_vma_destroy_unlocked(). However,
xe_vm_pt_destroy() was previously invoked before processing contested
VMAs, destroying vm->pt_root while those VMAs were still linked to their
respective buffer objects (vm_bo->list.gpuva).

If a concurrent thread evicts one of those shared buffer objects,
xe_bo_trigger_rebind() holding only bo->resv walks the BO's VMAs and, in
fault mode, calls xe_vm_invalidate_vma() -> xe_pt_zap_ptes(). Because
vm->pt_root[tile->id] is already NULL, dereferencing pt->level causes a
NULL ptr deref.

Fix this by deferring xe_vm_free_scratch() and xe_vm_pt_destroy() until
after all contested VMAs have been unlinked and destroyed.

User is reporting hitting a NULL ptr deref in xe_pt_zap_ptes(), which
could be explained by this race.

(cherry picked from commit c2863648959489767f08892fd6e90577d2ea0b6a)

## Affected

- `Linux >= b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc < 70fddc065ac80845ffd33095b3635d59883cf7e6`
- `Linux >= b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc < ba678c2b02e0d36b53deb5a6d5e5ea044d36def7`
- `Linux >= b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc < bddaa5e4094c134452c29e20a26c4718827e4cb1`
- `Linux >= b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc < 24a22fb3c731474b68e986af6804db450fb88617`
- `Linux 6.8`

## Remediation

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