---
id: CVE-2026-43280
title: 'drm/xe: Add bounds check on pat_index to prevent OOB kernel read in madvise'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/xe: Add bounds check on pat_index to prevent OOB kernel read in madvise

  When user provides a bogus pat_index value through the madvise IOCTL, the
  xe_pat_index_get_…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ada7486c5668db542a7d361268df931aca5b726a <
    ffba51100ff61792fefbae11ca38ac1987a818dd
  - >-
    Linux >= ada7486c5668db542a7d361268df931aca5b726a <
    79f52655567a6471ff3d0d6325ede91bb14461f4
  - >-
    Linux >= ada7486c5668db542a7d361268df931aca5b726a <
    fbbe32618e97eff81577a01eb7d9adcd64a216d7
  - Linux 6.18
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-16T15:16:15.978847Z'
published: '2026-05-06'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:20:38.345Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43280'
references:
  - url: 'https://git.kernel.org/stable/c/ffba51100ff61792fefbae11ca38ac1987a818dd'
  - url: 'https://git.kernel.org/stable/c/79f52655567a6471ff3d0d6325ede91bb14461f4'
  - url: 'https://git.kernel.org/stable/c/fbbe32618e97eff81577a01eb7d9adcd64a216d7'
tags:
  - cve.org
epss: 0.00164
epssPercentile: 0.05254
ingestedAt: '2026-10-16T17:24:46.690Z'
---

## Overview

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

drm/xe: Add bounds check on pat_index to prevent OOB kernel read in madvise

When user provides a bogus pat_index value through the madvise IOCTL, the
xe_pat_index_get_coh_mode() function performs an array access without
validating bounds. This allows a malicious user to trigger an out-of-bounds
kernel read from the xe->pat.table array.

The vulnerability exists because the validation in madvise_args_are_sane()
directly calls xe_pat_index_get_coh_mode(xe, args->pat_index.val) without
first checking if pat_index is within [0, xe->pat.n_entries).

Although xe_pat_index_get_coh_mode() has a WARN_ON to catch this in debug
builds, it still performs the unsafe array access in production kernels.

v2(Matthew Auld)
- Using array_index_nospec() to mitigate spectre attacks when the value
is used

v3(Matthew Auld)
- Put the declarations at the start of the block

(cherry picked from commit 944a3329b05510d55c69c2ef455136e2fc02de29)

## Affected

- `Linux >= ada7486c5668db542a7d361268df931aca5b726a < ffba51100ff61792fefbae11ca38ac1987a818dd`
- `Linux >= ada7486c5668db542a7d361268df931aca5b726a < 79f52655567a6471ff3d0d6325ede91bb14461f4`
- `Linux >= ada7486c5668db542a7d361268df931aca5b726a < fbbe32618e97eff81577a01eb7d9adcd64a216d7`
- `Linux 6.18`

## Remediation

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