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CVE-2026-63849

drm/amdgpu/vcn: set no_user_fence for VCN v5.0.1 enc ring

HIGH
7.8
CVSS Score
Published: July 19, 2026 at 02:04 PM UTC
Updated: October 22, 2026 at 07:18 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 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

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

Linux Kernel· Linux
95%
6.14 ≤ v < 6.18.336.19 ≤ v < 7.0.10346492f30ce3581bf5324c4ae417eab8537dc9986.147.1
Vendor states this is fixed in 081ef0e46c9cdd26c0db0ef721470393d36b6655 (fixed)
Vendor states this is fixed in 5a4bffd67e94944ed3db26a959346cfb7fabaecd (fixed)
Vendor states this is fixed in 8f4954722eab88e10c4ea0c0d3b1269c31421d3a (fixed)
Vendor states this is fixed in 6.14 (unaffected)
Vendor states this is fixed in 6.18.33 (unaffected)
Vendor states this is fixed in 7.0.10 (unaffected)
Vendor states this is fixed in 7.1 (unaffected)

References (3)

Patch
Source: cverecord
https://git.kernel.org/stable/c/081ef0e46c9cdd26c0db0ef721470393d36b6655
Patch
Source: cverecord
https://git.kernel.org/stable/c/5a4bffd67e94944ed3db26a959346cfb7fabaecd
Patch
Source: cverecord
https://git.kernel.org/stable/c/8f4954722eab88e10c4ea0c0d3b1269c31421d3a

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

StatusANALYZED
CWE
CWE-20NVD-CWE-noinfo

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