CVE-2026-80549 s390/vfio_ccw: Move cp cleanup out of not operational
A race condition in the s390 vfio_ccw driver can cause a deadlock or crash when device cleanup occurs while holding locks.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80549?
CVE-2026-80549 is a high-severity 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:
s390/vfio_ccw: Move cp cleanup out of not operational
The fsm_notoper() routine is called when the device has been lost, and is (by definition) no longer operational. Since this can happen asynchronously from the normal behavior of the driver, the cleanup may happen when holding other locks in the calling sequence (notably, the cio subchannel lock).
Push the cleanup of the private->cp resources to a workqueue, where it can be done out from under that lock sequence and a future patch can safely manage the locking requirements.
Which versions are affected by CVE-2026-80549?
How do I fix CVE-2026-80549?
Apply the vendor's patch.
Is CVE-2026-80549 being exploited?
There is no known exploitation of CVE-2026-80549 in the wild and no public exploit code.
Sources
Also known as AZL-97755, BELL-CVE-2026-80549, DEBIAN-CVE-2026-80549, GHSA-664j-v92h-9gpp, UBUNTU-CVE-2026-80549.