Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-64264
Published: July 27, 2026
Vulnerability identifier: #VU139727
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64264
CWE-ID: CWE-703
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause incorrect handling of a failed request.
The vulnerability exists due to improper error handling in fuse_uring_commit when copying an output header from user memory. A local user can trigger a copy_from_user() failure to cause incorrect handling of a failed request.
The positive residual value can be interpreted as success, causing the caller to proceed with an uninitialised or partially populated req->out.args.
Affected software
Linux kernel
How to mitigate CVE-2026-64264
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3