CVE-2026-80547 s390/vfio_ccw: Implement a crw lock
A missing lock in the s390 vfio_ccw driver allows race conditions on asynchronous hardware events, potentially causing system instability or 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-2026-80547?
CVE-2026-80547 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: Implement a crw lock
Unlike the channel_program struct, which covers synchronous I/O submissions and asynchronous interrupts, the CRW region relies exclusively on asynchronous events coming from hardware.
Implement a lock to manage the list of those payloads, to ensure they are read cohesively.
Which versions are affected by CVE-2026-80547?
How do I fix CVE-2026-80547?
Apply the vendor's patch.
Is CVE-2026-80547 being exploited?
There is no known exploitation of CVE-2026-80547 in the wild and no public exploit code.
Sources
Also known as AZL-97737, BELL-CVE-2026-80547, DEBIAN-CVE-2026-80547, GHSA-9vqh-hxm7-9fwm, UBUNTU-CVE-2026-80547.