CVE-2026-68454 KVM: s390: pci: Fix handling of AIF enable without AISB
A null pointer dereference in KVM s390 PCI handling allows a guest to cause a kernel crash by registering IRQs without a summary bit.
- 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-2026-68454?
CVE-2026-68454 is a high-severity vulnerability in Linux, published on 13 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:
KVM: s390: pci: Fix handling of AIF enable without AISB
When a guest seeks to register IRQs without a summary bit specified, ensure that the associated GAITE then stores 0 for the guest AISB location instead of virt_to_phys(page_address(NULL)).
Weakness: CWE-20
Which versions are affected by CVE-2026-68454?
How do I fix CVE-2026-68454?
Apply the vendor's patch.
Is CVE-2026-68454 being exploited?
There is no known exploitation of CVE-2026-68454 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68454, DEBIAN-CVE-2026-68454, GHSA-4h5w-742q-hw8j, UBUNTU-CVE-2026-68454.