CVE-2026-80856

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A lock leak occurs in the FUSE filesystem when a writeback flush fails during a setattr operation. Specifically, the fuse do setattr() function acquires the filemap invalidate lock() for a DAX truncate. If a subsequent call to write inode now() fails, the function returns an error immediately without releasing the lock. This results in a stale rwsem (read-write semaphore), causing any subsequent fault or truncate operations on the affected file to stall. This issue also affects the failure path of the fuse dax break layouts() function.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.