Copyright © 2012 Red Hat, Inc. All rights reserved. Low 2026-08-15T00:00:00 kernel: KVM: s390: pci: Fix GISC refcount leak on AIF enable failure 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-911

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Fix GISC refcount leak on AIF enable failure kvm_s390_gisc_register() registers the guest ISC before pinning the guest interrupt forwarding pages and allocating the AISB bit. If any of the later setup steps fails, the function unwinds the pinned pages and other local state, but does not unregister the GISC reference. Add the missing kvm_s390_gisc_unregister() to the error unwind path.

A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) for s390 PCI. During the setup of guest interrupt forwarding, a reference count (refcount) to the Guest Interrupt Service Call (GISC) may not be properly released if subsequent setup steps fail. This resource leak can lead to resource exhaustion, potentially allowing a local attacker to cause a Denial of Service (DoS) to the virtualized environment.

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-2026-72290 https://nvd.nist.gov/vuln/detail/CVE-2026-72290 https://lore.kernel.org/linux-cve-announce/2026081500-CVE-2026-72290-024c@gregkh/T