Review reviewHigh

CVE-2026-63854

Linux

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)

CVSS: 7.8
EPSS: -
CISA KEV: Not listed
Published: 2026.07.20

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability-

Technical severityCVSS 7.8

Vulnerability overview

Affected product and versions

Product: Linux
Affected versions: >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < e74fc9c72c1ba78d0de0b849f5929c3b39a8e20c, >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < 26c4f38529ac78930c9c4713e16ebc5b689bb0a3, >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < 2d6525e7b2504f5bbfe9417cddc1e8da858791dd, >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < b076e45e6f757a2829e80d0144c1b5f201bee5af, >= cf14826cdfb5c9fe10f98210d040b9d7486c381d < f1e5a6660d7cbf006079126d9babbf0ccf538c6b, >= 5.9
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: Not available