CVE-2026-80684 KVM: s390: pci: Fix NULL dereference on AIBV allocation failure
A missing NULL check in the Linux kernel's KVM s390 PCI code allows a local attacker to cause a denial of service via a NULL pointer dereference.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80684?
CVE-2026-80684 is a critical vulnerability in Linux, published on 28 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 NULL dereference on AIBV allocation failure
The airq_iv_create() can return NULL on failure, but the return value was never checked. If it fails, zdev->aibv will be NULL and fail when dereferenced in kvm_zpci_set_airq(). Add a NULL check and free the previously allocated AISB bit and zdev->aisb on failure.
Which versions are affected by CVE-2026-80684?
How do I fix CVE-2026-80684?
Apply the vendor's patch.
Is CVE-2026-80684 being exploited?
There is no known exploitation of CVE-2026-80684 in the wild and no public exploit code.
Sources
Also known as AZL-98057, BELL-CVE-2026-80684, DEBIAN-CVE-2026-80684, GHSA-q4fh-xh4r-x3xp, UBUNTU-CVE-2026-80684.