---
id: CVE-2026-63849
title: 'drm/amdgpu/vcn: set no_user_fence for VCN v5.0.1 enc ring'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/amdgpu/vcn: set no_user_fence for VCN v5.0.1 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 >= 346492f30ce3581bf5324c4ae417eab8537dc998 <
    081ef0e46c9cdd26c0db0ef721470393d36b6655
  - >-
    Linux >= 346492f30ce3581bf5324c4ae417eab8537dc998 <
    5a4bffd67e94944ed3db26a959346cfb7fabaecd
  - >-
    Linux >= 346492f30ce3581bf5324c4ae417eab8537dc998 <
    8f4954722eab88e10c4ea0c0d3b1269c31421d3a
  - Linux 6.14
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:32:07.985488Z'
published: '2026-07-19'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:42:07.259Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-63849'
references:
  - url: 'https://git.kernel.org/stable/c/081ef0e46c9cdd26c0db0ef721470393d36b6655'
  - url: 'https://git.kernel.org/stable/c/5a4bffd67e94944ed3db26a959346cfb7fabaecd'
  - url: 'https://git.kernel.org/stable/c/8f4954722eab88e10c4ea0c0d3b1269c31421d3a'
tags:
  - cve.org
epss: 0.00173
epssPercentile: 0.06313
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 v5.0.1 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 e16be95a2c3ee712b142cb27d2dca0b461181359)

## Affected

- `Linux >= 346492f30ce3581bf5324c4ae417eab8537dc998 < 081ef0e46c9cdd26c0db0ef721470393d36b6655`
- `Linux >= 346492f30ce3581bf5324c4ae417eab8537dc998 < 5a4bffd67e94944ed3db26a959346cfb7fabaecd`
- `Linux >= 346492f30ce3581bf5324c4ae417eab8537dc998 < 8f4954722eab88e10c4ea0c0d3b1269c31421d3a`
- `Linux 6.14`

## Remediation

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