---
id: CVE-2026-68264
title: 'drm/xe/pt: Reset current_op in xe_pt_update_ops_init()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/xe/pt: Reset current_op in xe_pt_update_ops_init()

  xe_pt_update_ops_init() fails to reset current_op to 0. On the
  vm_bind path, ops_execute() calls xe_pt_update_op…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 <
    be5c39730ab8f1dfe59983bf7d8e3705541d1fee
  - >-
    Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 <
    157b1e3384d7d37f59c0c2b2ff2af8f557db1daa
  - >-
    Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 <
    90e4fd331b980259c40118d05b89b0ec514e7c48
  - >-
    Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 <
    6384271ac1ac0099198d15df79212a19ebdb929d
  - Linux 6.12
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:46:21.749060Z'
published: '2026-08-10'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:53:05.337Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-68264'
references:
  - url: 'https://git.kernel.org/stable/c/be5c39730ab8f1dfe59983bf7d8e3705541d1fee'
  - url: 'https://git.kernel.org/stable/c/157b1e3384d7d37f59c0c2b2ff2af8f557db1daa'
  - url: 'https://git.kernel.org/stable/c/90e4fd331b980259c40118d05b89b0ec514e7c48'
  - url: 'https://git.kernel.org/stable/c/6384271ac1ac0099198d15df79212a19ebdb929d'
tags:
  - cve.org
epss: 0.00138
epssPercentile: 0.02846
ingestedAt: '2026-10-16T17:24:46.851Z'
---

## Overview

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

drm/xe/pt: Reset current_op in xe_pt_update_ops_init()

xe_pt_update_ops_init() fails to reset current_op to 0. On the
vm_bind path, ops_execute() calls xe_pt_update_ops_prepare() inside
the xe_validation_guard() / drm_exec_until_all_locked() loop. When
that loop retries due to lock contention or OOM eviction
(drm_exec_retry_on_contention() / xe_validation_retry_on_oom()),
xe_pt_update_ops_prepare() runs again on the same vops, and each
call to bind_op_prepare() increments current_op without resetting it.

After N retries current_op exceeds the array size allocated by
xe_vma_ops_alloc(), causing an out-of-bounds write into
SLUB-poisoned memory and a subsequent UAF crash in
xe_migrate_update_pgtables_cpu() when reading the corrupted pt_op->bind.

Also reset needs_svm_lock and needs_invalidation which are derived in
the same prepare pass and would otherwise cause wrong migrate ops
selection and redundant TLB invalidation on retry.

Fix this by resetting current_op, needs_svm_lock and needs_invalidation
in xe_pt_update_ops_init().

v2 (Matt):
   - Add details in commit message.
   - Add Fixes tag and Cc to stable@vger.kernel.org

(cherry picked from commit 046045543e530605c441063535e7dca0075369a6)

## Affected

- `Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 < be5c39730ab8f1dfe59983bf7d8e3705541d1fee`
- `Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 < 157b1e3384d7d37f59c0c2b2ff2af8f557db1daa`
- `Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 < 90e4fd331b980259c40118d05b89b0ec514e7c48`
- `Linux >= e8babb280b5ef904df54b3a90e5a7e3a9600c4a9 < 6384271ac1ac0099198d15df79212a19ebdb929d`
- `Linux 6.12`

## Remediation

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