CVE-2026-80684
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.
CSIRTS triage
- What
- NULL pointer dereference in KVM s390 PCI code when AIBV allocation fails.
- Who is affected
- s390 architecture systems running KVM hypervisor on vulnerable Linux kernels.
- Urgency
- Medium priority; not exploited but can cause guest VM crashes on allocation failures.
- Action
- Update to a patched Linux kernel version with NULL dereference handling for KVM s390 PCI AIBV allocation.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
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