---
id: CVE-2026-63854
title: 'drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings

  VCN encoder and decoder rings do not support 64-bit user fence writes,
  reject CS submissions with user fen…
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 >= cf14826cdfb5c9fe10f98210d040b9d7486c381d <
    e74fc9c72c1ba78d0de0b849f5929c3b39a8e20c
  - >-
    Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d <
    26c4f38529ac78930c9c4713e16ebc5b689bb0a3
  - >-
    Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d <
    2d6525e7b2504f5bbfe9417cddc1e8da858791dd
  - >-
    Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d <
    b076e45e6f757a2829e80d0144c1b5f201bee5af
  - >-
    Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d <
    f1e5a6660d7cbf006079126d9babbf0ccf538c6b
  - Linux 5.9
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:32:20.319659Z'
published: '2026-07-19'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:42:08.010Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-63854'
references:
  - url: 'https://git.kernel.org/stable/c/e74fc9c72c1ba78d0de0b849f5929c3b39a8e20c'
  - url: 'https://git.kernel.org/stable/c/26c4f38529ac78930c9c4713e16ebc5b689bb0a3'
  - url: 'https://git.kernel.org/stable/c/2d6525e7b2504f5bbfe9417cddc1e8da858791dd'
  - url: 'https://git.kernel.org/stable/c/b076e45e6f757a2829e80d0144c1b5f201bee5af'
  - url: 'https://git.kernel.org/stable/c/f1e5a6660d7cbf006079126d9babbf0ccf538c6b'
tags:
  - cve.org
epss: 0.00175
epssPercentile: 0.06543
ingestedAt: '2026-10-16T17:24:46.759Z'
---

## Overview

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

drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings

VCN encoder and decoder rings do not support 64-bit user fence writes,
reject CS submissions with user fences.

(cherry picked from commit 663bed3c7b8b9a7624b0d95d300ddae034ad0614)

## Affected

- `Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < e74fc9c72c1ba78d0de0b849f5929c3b39a8e20c`
- `Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < 26c4f38529ac78930c9c4713e16ebc5b689bb0a3`
- `Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < 2d6525e7b2504f5bbfe9417cddc1e8da858791dd`
- `Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < b076e45e6f757a2829e80d0144c1b5f201bee5af`
- `Linux >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < f1e5a6660d7cbf006079126d9babbf0ccf538c6b`
- `Linux 5.9`

## Remediation

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