CVE-2026-80535 xfs: don't double-lock when deleting a self-referential directory
A local attacker can cause a denial of service by triggering a double-lock condition in the XFS filesystem when deleting a self-referential directory.
- 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-2026-80535?
CVE-2026-80535 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: don't double-lock when deleting a self-referential directory
LOLLM notices that the dirtree scrubber can detect a directory that refers to itself. In this case, it's not correct for the directory tree repair code to try to iolock/ilock both sc->ip and dp, because they're the same inode. Fix this by detecting that corner case and handling it appropriately.
Which versions are affected by CVE-2026-80535?
How do I fix CVE-2026-80535?
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-2026-80535 being exploited?
There is no known exploitation of CVE-2026-80535 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80535, DEBIAN-CVE-2026-80535, UBUNTU-CVE-2026-80535.