Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-08-28T00:00:00 kernel: KVM: s390: pci: Fix NULL dereference on AIBV allocation failure 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-476

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.

A flaw was found in the KVM (Kernel-based Virtual Machine) subsystem for s390 PCI devices in the Linux kernel. This vulnerability occurs when the `airq_iv_create()` function fails to allocate a resource, returning a NULL value that is not properly checked. An attacker, potentially a malicious guest user, could exploit this unchecked return value, leading to a NULL pointer dereference in `kvm_zpci_set_airq()`. This could result in a system crash, causing a Denial of Service (DoS).

Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Fix deferred kernel Red Hat Enterprise Linux 8 Fix deferred kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Fix deferred kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-80684 https://nvd.nist.gov/vuln/detail/CVE-2026-80684 https://lore.kernel.org/linux-cve-announce/2026082802-CVE-2026-80684-a2a8@gregkh/T