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CVE-2026-63853

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

HIGH
7.8
CVSS Score
Published: July 19, 2026 at 02:04 PM UTC
Updated: October 30, 2026 at 01:19 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
5.19 ≤ v < 6.6.1606.13 ≤ v < 6.18.336.19 ≤ v < 7.0.106.7 ≤ v < 6.12.1145.197.18da1170a16e4d4b49fa07d1f75ad480847ff7eca
Vendor states this is fixed in 1286b6872de0aee1feeeaa6dbac86369806de9a5 (fixed)
Vendor states this is fixed in 51f694221047c84fa185be98210eb2c354ffb8c6 (fixed)
Vendor states this is fixed in 6bdd2ed6458d35c368fbe9550a4d7f342abd3a92 (fixed)
Vendor states this is fixed in 5.19 (unaffected)
Vendor states this is fixed in 6.12.114 (unaffected)
Vendor states this is fixed in 6.18.33 (unaffected)
Vendor states this is fixed in 6.6.160 (unaffected)
Vendor states this is fixed in 7.0.10 (unaffected)
Vendor states this is fixed in 7.1 (unaffected)

References (6)

Patch
Source: cverecord
https://git.kernel.org/stable/c/1286b6872de0aee1feeeaa6dbac86369806de9a5
Patch
Source: cverecord
https://git.kernel.org/stable/c/6bdd2ed6458d35c368fbe9550a4d7f342abd3a92
Patch
Source: cverecord
https://git.kernel.org/stable/c/51f694221047c84fa185be98210eb2c354ffb8c6
Patch
Source: cverecord
https://git.kernel.org/stable/c/525cc9df654365c147ae61e5562cf599ea2257f7
Patch
Source: cverecord
https://git.kernel.org/stable/c/d8df8918677136b018d71d0b94a1f6b816715946
Source: cverecord
https://git.kernel.org/stable/c/772f83fc70b797ac88d696671780eaf175cc7f31

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20NVD-CWE-noinfo

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