Linux Kernel netfs/afs: Fix Write-Page Skip Handling
CVE-2026-64156 Published on July 19, 2026
netfs, afs: Fix write skipping in dir/link writepages
In the Linux kernel, the following vulnerability has been resolved:
netfs, afs: Fix write skipping in dir/link writepages
Fix netfs_write_single() and afs_single_writepages() to better handle a
write that would be skipped due to lock contention and WB_SYNC_NONE by
returning 1 from netfs_write_single() if it skipped and making
afs_single_writepages() 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 netfs_write_single() as
the only path to that is through afs_single_writepages() that takes the
->validate_lock around it, thereby serialising it.
Products Associated with CVE-2026-64156
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Affected Versions
Linux:- Version 6dd80936618c4ff852d4db73aca400351d9bd9f0 and below 77bb293049d61e04c12b24ebbffafaf5ab36af90 is affected.
- Version 6dd80936618c4ff852d4db73aca400351d9bd9f0 and below f91e10435c0dd37c48b1b25e6236284f656ddc0c is affected.
- Version 6dd80936618c4ff852d4db73aca400351d9bd9f0 and below 9871938f99cc6cb266a77265491660e2375271f5 is affected.
- Version 6.14 is affected.
- Before 6.14 is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.