Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-63846
Published: July 20, 2026
Vulnerability identifier: #VU138806
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-63846
CWE-ID: CWE-703
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper handling of unsupported user fence writes in jpeg v3.0 ring handling when processing command submissions with user fences. A local user can submit a command stream with a user fence to cause a denial of service.
The issue affects JPEG v3.0 rings, which do not support 64-bit user fence writes.
How to mitigate CVE-2026-63846
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/303da8279f195cc741adc52c1b44d6b64de63bb0
- https://git.kernel.org/stable/c/48ce00787e3fddd2b45692fc991b8ab128343da5
- https://git.kernel.org/stable/c/5ada37d7f736f9feeaa06a25e470a4c74e67a61a
- https://git.kernel.org/stable/c/a2baf12eec41f246689e6a3f8619af1200031576
- https://git.kernel.org/stable/c/ee035a9d3eed3a9f5a3e83c31a10b321c9598861