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  4. CVE 2026 63850 drmamdgpuvcn set nouserfence for vcn v500 enc ring
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Back to active CVEs
High · CVSS 7.8CVE-2026-63850

drm/amdgpu/vcn: set no_user_fence for VCN v5.0.0 enc ringCVE-2026-63850

Answer in brief

CVE-2026-63850 records a High severity (CVSS 7.8) vulnerability in drm/amdgpu/vcn: set no_user_fence for VCN v5.0.0 enc ring. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 19, 2026Updated Oct 22, 2026Source checked Nov 3, 2026First seen by HOL Aug 5, 2026Material review Oct 22, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=b6d1a06320519ac3bfda6ce81067a1bc409b9cff <9f5a1459ecc3195282be617639d710b54779c9dc || >=b6d1a06320519ac3bfda6ce81067a1bc409b9cff <139a8a52ef4349c62129703b3a3e3a6ae4d634eb || >=b6d1a06320519ac3bfda6ce81067a1bc409b9cff <2c350f3cd94be847ac216e1358ec7001eaaf0934 || >=b6d1a06320519ac3bfda6ce81067a1bc409b9cff <8cae0ce77de492d7c31c1532a2e80c0c6e7e58cb9f5a1459ecc3195282be617639d710b54779c9dc, 139a8a52ef4349c62129703b3a3e3a6ae4d634eb, 2c350f3cd94be847ac216e1358ec7001eaaf0934, 8cae0ce77de492d7c31c1532a2e80c0c6e7e58cb
Linux/Linuxgeneric6.9Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 9f5a1459ecc3195282be617639d710b54779c9dc if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Jul 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 5, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: set no_user_fence for VCN v5.0.0 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 49b1fbbb5a071197ee71e2d70959b1cb29bdc317)

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Tanium addressed an improper input validation vulnerability in Threat Response.Also CWE-20
  • Tanium addressed an improper input validation vulnerability in Threat Response.Also CWE-20

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-20, NVD-CWE-noinfo
Source
CVE List V5
Source checked
Nov 3, 2026
References
4 linked sources
Open source record