CVE-2026-64156

In the Linux kernel, the following vulnerability has been resolved:

netfs, afs: Fix write skipping in dir/link writepages

Fix netfswritesingle() and afssinglewritepages() to better handle a write that would be skipped due to lock contention and WBSYNCNONE by returning 1 from netfswritesingle() if it skipped and making afssinglewritepages() skip also. If a skip occurs, the inode must be re-marked as the VFS may have cleared the mark.

This is really only theoretical for directories in netfswritesingle() as the only path to that is through afssinglewritepages() that takes the ->validate_lock around it, thereby serialising it.