Bug 2502289 (CVE-2026-63856) - CVE-2026-63856 kernel: drm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec rings
Summary: CVE-2026-63856 kernel: drm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec...
Keywords:
Status: NEW
Alias: CVE-2026-63856
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-19 15:02 UTC by OSIDB Bzimport
Modified: 2026-07-31 18:45 UTC (History)
2 users (show)

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

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Description OSIDB Bzimport 2026-07-19 15:02:11 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu/vcn: set no_user_fence for VCN v2.0 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 e2b5499fca55f1a32960a311bbb62e35891eaf73)
Comment 1 Keith Grant 2026-07-21 18:42:56 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071932-CVE-2026-63856-cac0@gregkh/T
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