In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0.5 ring JPEG rings do not… (CVE-2026-63843)
A vulnerability in the Linux kernel's AMDGPU JPEG driver was resolved by setting the no_user_fence flag for the JPEG v4.0.5 ring. The issue involved the JPEG rings not supporting 64-bit user fence writes, leading to rejection of command submissions with user fences. This fix was applied via a specific commit to prevent improper handling of user fences in the JPEG ring.
AI Analysis
Technical Summary
The Linux kernel AMDGPU JPEG driver had a vulnerability where the JPEG rings did not support 64-bit user fence writes. As a result, command submissions (CS) containing user fences could be improperly processed. The vulnerability was addressed by setting the no_user_fence flag for the JPEG v4.0.5 ring, causing the driver to reject CS submissions with user fences. This change was incorporated through a kernel commit (f05d0a4f21fc720116d6e238f23308b199891058).
Potential Impact
The vulnerability could allow improper handling of user fence writes in the AMDGPU JPEG driver, potentially leading to incorrect synchronization or processing of GPU commands. However, no known exploits in the wild have been reported, and the fix prevents submissions with unsupported user fences, mitigating the issue.
Mitigation Recommendations
A fix has been applied in the Linux kernel by setting the no_user_fence flag for the JPEG v4.0.5 ring. Users should update their Linux kernel to a version that includes this commit to ensure the vulnerability is resolved. Patch status is confirmed by the vendor commit; no additional mitigation is required beyond applying the official fix.
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0.5 ring JPEG rings do not… (CVE-2026-63843)
Description
A vulnerability in the Linux kernel's AMDGPU JPEG driver was resolved by setting the no_user_fence flag for the JPEG v4.0.5 ring. The issue involved the JPEG rings not supporting 64-bit user fence writes, leading to rejection of command submissions with user fences. This fix was applied via a specific commit to prevent improper handling of user fences in the JPEG ring.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel AMDGPU JPEG driver had a vulnerability where the JPEG rings did not support 64-bit user fence writes. As a result, command submissions (CS) containing user fences could be improperly processed. The vulnerability was addressed by setting the no_user_fence flag for the JPEG v4.0.5 ring, causing the driver to reject CS submissions with user fences. This change was incorporated through a kernel commit (f05d0a4f21fc720116d6e238f23308b199891058).
Potential Impact
The vulnerability could allow improper handling of user fence writes in the AMDGPU JPEG driver, potentially leading to incorrect synchronization or processing of GPU commands. However, no known exploits in the wild have been reported, and the fix prevents submissions with unsupported user fences, mitigating the issue.
Mitigation Recommendations
A fix has been applied in the Linux kernel by setting the no_user_fence flag for the JPEG v4.0.5 ring. Users should update their Linux kernel to a version that includes this commit to ensure the vulnerability is resolved. Patch status is confirmed by the vendor commit; no additional mitigation is required beyond applying the official fix.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-cm3g-53f9-759w
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-63843"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5d27ac2a4a8d5989130ca8
Added to database: 07/19/2026, 19:38:20 UTC
Last enriched: 07/19/2026, 20:16:50 UTC
Last updated: 07/20/2026, 17:26:47 UTC
Views: 11
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.