In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/jpeg: set no_user_fence for JPEG v5.3.0 ring JPEG rings do not… (CVE-2026-63840)
A vulnerability in the Linux kernel's AMDGPU JPEG driver was resolved by setting the no_user_fence flag for the JPEG v5.3.0 ring. The issue involved JPEG rings not supporting 64-bit user fence writes, leading to rejection of command submissions with user fences. This fix prevents improper handling of user fences in the affected component.
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, which could cause issues when command submissions included user fences. The vulnerability was addressed by setting the no_user_fence flag for the JPEG v5.3.0 ring, effectively rejecting submissions with user fences to prevent misuse. This fix was applied via a specific commit (86ac011ae234c03fb872f4945913391ea1d8862e).
Potential Impact
The vulnerability could lead to improper handling of user fence writes in the AMDGPU JPEG driver, potentially causing stability or security issues related to command submission processing. No known exploits in the wild have been reported.
Mitigation Recommendations
An official fix has been applied in the Linux kernel by setting the no_user_fence flag for the JPEG v5.3.0 ring. Users should update their Linux kernel to a version that includes this fix. Patch status is confirmed resolved by the vendor commit. No additional mitigation steps are indicated.
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/jpeg: set no_user_fence for JPEG v5.3.0 ring JPEG rings do not… (CVE-2026-63840)
Description
A vulnerability in the Linux kernel's AMDGPU JPEG driver was resolved by setting the no_user_fence flag for the JPEG v5.3.0 ring. The issue involved JPEG rings not supporting 64-bit user fence writes, leading to rejection of command submissions with user fences. This fix prevents improper handling of user fences in the affected component.
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, which could cause issues when command submissions included user fences. The vulnerability was addressed by setting the no_user_fence flag for the JPEG v5.3.0 ring, effectively rejecting submissions with user fences to prevent misuse. This fix was applied via a specific commit (86ac011ae234c03fb872f4945913391ea1d8862e).
Potential Impact
The vulnerability could lead to improper handling of user fence writes in the AMDGPU JPEG driver, potentially causing stability or security issues related to command submission processing. No known exploits in the wild have been reported.
Mitigation Recommendations
An official fix has been applied in the Linux kernel by setting the no_user_fence flag for the JPEG v5.3.0 ring. Users should update their Linux kernel to a version that includes this fix. Patch status is confirmed resolved by the vendor commit. No additional mitigation steps are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-9f56-6f5c-c8vx
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-63840"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5d27ac2a4a8d5989130f9b
Added to database: 07/19/2026, 19:38:20 UTC
Last enriched: 07/19/2026, 20:17:04 UTC
Last updated: 07/20/2026, 07:30:55 UTC
Views: 9
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.