Bug 2502278 (CVE-2026-63851) - CVE-2026-63851 kernel: drm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 enc ring
Summary: CVE-2026-63851 kernel: drm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 enc ring
Keywords:
Status: NEW
Alias: CVE-2026-63851
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-19 15:01 UTC by OSIDB Bzimport
Modified: 2026-07-20 18:00 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Description OSIDB Bzimport 2026-07-19 15:01:38 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 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 084d94ac93707bdda07efb5cee786f632de4219b)
Comment 1 Keith Grant 2026-07-20 17:56:23 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071931-CVE-2026-63851-b10e@gregkh/T
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