CVE-2026-80532 xfs: fix another iunlink infinite loop bug in online fsck
An infinite loop in the XFS online fsck component allows local attackers to cause a denial of service by triggering specific unlinked list conditions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80532?
CVE-2026-80532 is a denial of service vulnerability in Linux, published on 26 Aug 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:
xfs: fix another iunlink infinite loop bug in online fsck
xrep_iunlink_resolve_bucket is supposed to reconstruct as much of the incore prev and next unlinked list pointers based on what it finds on disk and in memory before we move on to relinking the truly lost inodes back into the unlinked list. However, it's still vulnerable to infinite loops that come in via the next_unlinked pointers.
Fix this problem by remembering which inodes we've already seen and checking new agino pointers against that. If a bit is already set, either this is a loop or the inode has nonzero link count. We'll deal with the second case in a subsequent patch.
Which versions are affected by CVE-2026-80532?
How do I fix CVE-2026-80532?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-80532 being exploited?
There is no known exploitation of CVE-2026-80532 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80532, DEBIAN-CVE-2026-80532, UBUNTU-CVE-2026-80532.