CVE-2026-89833 f2fs: fix to avoid potential deadloop in f2fs_fsync_node_pages()
A race condition in the Linux kernel f2fs filesystem can cause a deadloop, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89833?
CVE-2026-89833 is a vulnerability in Linux, published on 16 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
f2fs: fix to avoid potential deadloop in f2fs_fsync_node_pages()
There is potential deadloop in race condition:
Thread A Thread B - fsync - f2fs_do_sync_file - f2fs_fsync_node_pages - last_fsync_dnode - folio_get(last_folio) - f2fs_setattr - f2fs_truncate - f2fs_truncate_blocks - f2fs_do_truncate_blocks - f2fs_truncate_inode_blocks - truncate_dnode - truncate_node - invalidate_mapping_pages - folio->mapping = NULL - is_node_folio alwasy return false - atomic && !marked is always true, then goto retry
Which versions are affected by CVE-2026-89833?
How do I fix CVE-2026-89833?
Apply the vendor's patch.
Is CVE-2026-89833 being exploited?
There is no known exploitation of CVE-2026-89833 in the wild and no public exploit code.
Sources
Also known as AZL-101385, BELL-CVE-2026-89833, DEBIAN-CVE-2026-89833, GHSA-fw8r-p3gh-gw7x, UBUNTU-CVE-2026-89833.