In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0.3 ring JPEG rings do not… (CVE-2026-63844)
A vulnerability in the Linux kernel's AMDGPU JPEG driver was resolved by setting no_user_fence for the JPEG v4.0.3 ring. The issue involved the JPEG rings not supporting 64-bit user fence writes and rejecting command submissions that included user fences. This fix prevents improper handling of user fences in this component.
AI Analysis
Technical Summary
The Linux kernel AMDGPU JPEG driver had a vulnerability related to the handling of user fences on the JPEG v4.0.3 ring. Specifically, the JPEG rings do not support 64-bit user fence writes, and command submissions containing user fences were not properly rejected. The vulnerability was addressed by setting the no_user_fence flag for the JPEG ring, ensuring that such unsupported user fence writes are not processed. This fix was introduced via a commit cherry-picked into the kernel source.
Potential Impact
The vulnerability could allow improper command submissions involving unsupported 64-bit user fence writes to the AMDGPU JPEG ring, potentially leading to unexpected behavior or instability in the kernel graphics subsystem. No known exploits in the wild have been reported. The exact impact is not detailed in the available information.
Mitigation Recommendations
A fix has been applied in the Linux kernel by setting the no_user_fence flag for the AMDGPU JPEG v4.0.3 ring. Users should update to a kernel version that includes this commit to ensure the vulnerability is resolved. Since this is a kernel-level fix, applying the official kernel update from the vendor or distribution is the recommended remediation.
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0.3 ring JPEG rings do not… (CVE-2026-63844)
Description
A vulnerability in the Linux kernel's AMDGPU JPEG driver was resolved by setting no_user_fence for the JPEG v4.0.3 ring. The issue involved the JPEG rings not supporting 64-bit user fence writes and rejecting command submissions that included user fences. This fix prevents improper handling of user fences in this component.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel AMDGPU JPEG driver had a vulnerability related to the handling of user fences on the JPEG v4.0.3 ring. Specifically, the JPEG rings do not support 64-bit user fence writes, and command submissions containing user fences were not properly rejected. The vulnerability was addressed by setting the no_user_fence flag for the JPEG ring, ensuring that such unsupported user fence writes are not processed. This fix was introduced via a commit cherry-picked into the kernel source.
Potential Impact
The vulnerability could allow improper command submissions involving unsupported 64-bit user fence writes to the AMDGPU JPEG ring, potentially leading to unexpected behavior or instability in the kernel graphics subsystem. No known exploits in the wild have been reported. The exact impact is not detailed in the available information.
Mitigation Recommendations
A fix has been applied in the Linux kernel by setting the no_user_fence flag for the AMDGPU JPEG v4.0.3 ring. Users should update to a kernel version that includes this commit to ensure the vulnerability is resolved. Since this is a kernel-level fix, applying the official kernel update from the vendor or distribution is the recommended remediation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-9x48-m72f-7f2w
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-63844"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5d27ac2a4a8d5989130caf
Added to database: 07/19/2026, 19:38:20 UTC
Last enriched: 07/19/2026, 20:16:55 UTC
Last updated: 07/20/2026, 17:26:47 UTC
Views: 9
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