CVE-2026-80534 xfs: fix ilock leak on error in xfs_dq_get_next_id
A local attacker can trigger a lock leak in the XFS quota subsystem, causing subsequent quota operations to hang and resulting in a 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-2026-80534?
CVE-2026-80534 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 ilock leak on error in xfs_dq_get_next_id
xfs_dq_get_next_id() takes the quota inode ILOCK before calling xfs_iread_extents(). If xfs_iread_extents() fails, the function returns immediately without releasing the lock, leaking the quota inode ILOCK. This can leave the quota inode locked and cause subsequent quota operations to hang.
Fix this by jumping to a common unlock path on error instead of returning directly.
Which versions are affected by CVE-2026-80534?
How do I fix CVE-2026-80534?
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-2026-80534 being exploited?
There is no known exploitation of CVE-2026-80534 in the wild and no public exploit code.
Sources
Also known as AZL-97683, BELL-CVE-2026-80534, DEBIAN-CVE-2026-80534, GHSA-cm36-67fx-7wvw, UBUNTU-CVE-2026-80534.