CVE-2026-80552 s390/vfio_ccw: Ensure index for read/write regions are within range
A missing bounds check in the s390 vfio_ccw driver allows out-of-bounds access, potentially causing a kernel crash 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-2026-80552?
CVE-2026-80552 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: Ensure index for read/write regions are within range
The introduction of the capability chain rightly clamped the region indexes to the range of the capabilities itself, but neglected to do so for the existing read/write regions which should also be enforced.
Which versions are affected by CVE-2026-80552?
How do I fix CVE-2026-80552?
Apply the vendor's patch.
Is CVE-2026-80552 being exploited?
There is no known exploitation of CVE-2026-80552 in the wild and no public exploit code.
Sources
Also known as AZL-97827, BELL-CVE-2026-80552, DEBIAN-CVE-2026-80552, GHSA-fp69-7jh5-pp7r, UBUNTU-CVE-2026-80552.