In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings VCN encoder and… (CVE-2026-63854)
A vulnerability in the Linux kernel's AMDGPU driver related to the VCN v3.0 encoder and decoder rings has been resolved. The issue involved improper handling of 64-bit user fence writes, which are not supported by these rings. The fix involved setting the no_user_fence flag to reject command submissions that include user fences. This vulnerability has been addressed by a specific kernel commit.
AI Analysis
Technical Summary
The Linux kernel AMDGPU driver for VCN v3.0 encoder and decoder rings did not support 64-bit user fence writes, potentially allowing unsupported command submissions with user fences. The vulnerability was resolved by setting the no_user_fence flag for these rings, thereby rejecting submissions that include user fences. The fix was applied via a kernel commit (663bed3c7b8b9a7624b0d95d300ddae034ad0614). No further technical details or exploitation methods are provided.
Potential Impact
The vulnerability could have allowed unsupported command submissions involving 64-bit user fence writes to the VCN v3.0 encoder and decoder rings in the AMDGPU driver. The exact impact is not detailed, and no known exploits are reported. The fix prevents such submissions, mitigating potential risks associated with unsupported fence operations.
Mitigation Recommendations
This vulnerability has been resolved by an official kernel patch that sets the no_user_fence flag for the affected VCN v3.0 rings. Users should update their Linux kernel to a version that includes this fix. Patch status is not explicitly confirmed in the provided data; therefore, users should consult the vendor or Linux kernel advisory for the exact fixed versions and apply the update accordingly.
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings VCN encoder and… (CVE-2026-63854)
Description
A vulnerability in the Linux kernel's AMDGPU driver related to the VCN v3.0 encoder and decoder rings has been resolved. The issue involved improper handling of 64-bit user fence writes, which are not supported by these rings. The fix involved setting the no_user_fence flag to reject command submissions that include user fences. This vulnerability has been addressed by a specific kernel commit.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel AMDGPU driver for VCN v3.0 encoder and decoder rings did not support 64-bit user fence writes, potentially allowing unsupported command submissions with user fences. The vulnerability was resolved by setting the no_user_fence flag for these rings, thereby rejecting submissions that include user fences. The fix was applied via a kernel commit (663bed3c7b8b9a7624b0d95d300ddae034ad0614). No further technical details or exploitation methods are provided.
Potential Impact
The vulnerability could have allowed unsupported command submissions involving 64-bit user fence writes to the VCN v3.0 encoder and decoder rings in the AMDGPU driver. The exact impact is not detailed, and no known exploits are reported. The fix prevents such submissions, mitigating potential risks associated with unsupported fence operations.
Mitigation Recommendations
This vulnerability has been resolved by an official kernel patch that sets the no_user_fence flag for the affected VCN v3.0 rings. Users should update their Linux kernel to a version that includes this fix. Patch status is not explicitly confirmed in the provided data; therefore, users should consult the vendor or Linux kernel advisory for the exact fixed versions and apply the update accordingly.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-3g9q-994v-2h99
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-63854"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5d27ac2a4a8d5989130c82
Added to database: 07/19/2026, 19:38:20 UTC
Last enriched: 07/19/2026, 20:16:23 UTC
Last updated: 07/20/2026, 17:26:47 UTC
Views: 9
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