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… (CVE-2026-63852)
A vulnerability in the Linux kernel's AMDGPU driver for VCN v4.0.3 encoder and decoder rings was addressed by setting no_user_fence to reject command submissions with 64-bit user fence writes, which are unsupported. This fix prevents improper handling of user fences in the VCN encoder and decoder rings.
AI Analysis
Technical Summary
The Linux kernel AMDGPU driver for VCN v4.0.3 had a vulnerability where the encoder and decoder rings did not support 64-bit user fence writes. This could allow command submissions with user fences that are not properly handled. The vulnerability was resolved by setting the no_user_fence flag for the VCN v4.0.3 encoder ring, thereby rejecting submissions that include user fences. This fix was applied via a kernel commit (ff1a5a125c5a70c328806b9bc01d7d942cf3f9aa).
Potential Impact
The vulnerability could lead to improper handling of command submissions involving 64-bit user fence writes in the AMDGPU VCN encoder and decoder rings. The exact impact is not detailed, but improper fence handling could potentially cause instability or security issues in the graphics subsystem. No known exploits in the wild have been reported.
Mitigation Recommendations
A fix has been applied in the Linux kernel by setting no_user_fence for the affected VCN encoder ring to reject unsupported user fence submissions. Users should update to a Linux kernel version that includes this patch. Patch status is not explicitly confirmed in the provided data; check the vendor or Linux kernel advisories for the exact fixed versions and update accordingly.
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… (CVE-2026-63852)
Description
A vulnerability in the Linux kernel's AMDGPU driver for VCN v4.0.3 encoder and decoder rings was addressed by setting no_user_fence to reject command submissions with 64-bit user fence writes, which are unsupported. This fix prevents improper handling of user fences in the VCN encoder and decoder rings.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel AMDGPU driver for VCN v4.0.3 had a vulnerability where the encoder and decoder rings did not support 64-bit user fence writes. This could allow command submissions with user fences that are not properly handled. The vulnerability was resolved by setting the no_user_fence flag for the VCN v4.0.3 encoder ring, thereby rejecting submissions that include user fences. This fix was applied via a kernel commit (ff1a5a125c5a70c328806b9bc01d7d942cf3f9aa).
Potential Impact
The vulnerability could lead to improper handling of command submissions involving 64-bit user fence writes in the AMDGPU VCN encoder and decoder rings. The exact impact is not detailed, but improper fence handling could potentially cause instability or security issues in the graphics subsystem. No known exploits in the wild have been reported.
Mitigation Recommendations
A fix has been applied in the Linux kernel by setting no_user_fence for the affected VCN encoder ring to reject unsupported user fence submissions. Users should update to a Linux kernel version that includes this patch. Patch status is not explicitly confirmed in the provided data; check the vendor or Linux kernel advisories for the exact fixed versions and update accordingly.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-ggq9-85hc-h66h
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-63852"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5d27ac2a4a8d598913095a
Added to database: 07/19/2026, 19:38:20 UTC
Last enriched: 07/19/2026, 20:15:30 UTC
Last updated: 07/20/2026, 17:26:47 UTC
Views: 10
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