Review reviewHigh

CVE-2026-63852

Linux

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: set no_user_fence for VCN v4.0.3 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 ff1a5a125c5a70c328806b9bc01d7d942cf3f9aa)

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: >= b889ef4ac98837838c38f7b9f72bba2f33ee367d < c12a5d35033c0640c57c10d7111c010c7b9c2c8e, >= b889ef4ac98837838c38f7b9f72bba2f33ee367d < 387b7c7667bd5c53549350ddad866d2fcf75a529, >= b889ef4ac98837838c38f7b9f72bba2f33ee367d < 9076a83e5adefd10dc5c967c7b8bde601c4c512a, >= b889ef4ac98837838c38f7b9f72bba2f33ee367d < 0177ac6141c8857130cf365369c74dee7b6b1f7f, >= b889ef4ac98837838c38f7b9f72bba2f33ee367d < 4532b52b34e4e4310386e6fdf6a643368599f522, >= 6.5
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