---
id: CVE-2026-63853
title: 'drm/amdgpu/vcn: set no_user_fence for VCN v4.0 enc ring'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amdgpu/vcn: set no_user_fence for VCN v4.0 enc ring

  VCN encoder and decoder rings do not support 64-bit user fence writes,
  reject CS submissions with user fences.
  …
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 >= 8da1170a16e4d4b49fa07d1f75ad480847ff7eca <
    1286b6872de0aee1feeeaa6dbac86369806de9a5
  - >-
    Linux >= 8da1170a16e4d4b49fa07d1f75ad480847ff7eca <
    6bdd2ed6458d35c368fbe9550a4d7f342abd3a92
  - >-
    Linux >= 8da1170a16e4d4b49fa07d1f75ad480847ff7eca <
    51f694221047c84fa185be98210eb2c354ffb8c6
  - Linux 5.19
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:32:17.901838Z'
published: '2026-07-19'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:42:07.860Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-63853'
references:
  - url: 'https://git.kernel.org/stable/c/1286b6872de0aee1feeeaa6dbac86369806de9a5'
  - url: 'https://git.kernel.org/stable/c/6bdd2ed6458d35c368fbe9550a4d7f342abd3a92'
  - url: 'https://git.kernel.org/stable/c/51f694221047c84fa185be98210eb2c354ffb8c6'
tags:
  - cve.org
epss: 0.00173
epssPercentile: 0.06315
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 v4.0 enc ring

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

(cherry picked from commit fd852c048b46f9825e904a4f3f4538fe9d8827d9)

## Affected

- `Linux >= 8da1170a16e4d4b49fa07d1f75ad480847ff7eca < 1286b6872de0aee1feeeaa6dbac86369806de9a5`
- `Linux >= 8da1170a16e4d4b49fa07d1f75ad480847ff7eca < 6bdd2ed6458d35c368fbe9550a4d7f342abd3a92`
- `Linux >= 8da1170a16e4d4b49fa07d1f75ad480847ff7eca < 51f694221047c84fa185be98210eb2c354ffb8c6`
- `Linux 5.19`

## Remediation

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