{"id":"CVE-2026-98473","title":"kernel: s390/vfio-ap: fix KVM GISC and page leak when queue removed from host config (CVE-2026-98473)","summary":"A flaw was found in the Linux kernel's s390 Virtual Function I/O Adjunct Processor (VFIO-AP) device driver. A local user with administrative privileges can trigger this issue by removing an AP queue from the host configuration while it rem…","severity":"low","cvss":1.9,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L","cvssSource":"vendor","cwe":"CWE-772","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-10-18","updated":"2026-10-20","sourceUpdated":"2026-10-20T10:08:48+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98473.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98473.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98473"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554870"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98473"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98473"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98473.mbox"},{"url":"https://git.kernel.org/stable/c/da69d3ac53490724eba0ade9deb4e539a6ae9034"},{"url":"https://git.kernel.org/stable/c/cf441a0db681dfad5e89b015d6be11365159d7a9"},{"url":"https://git.kernel.org/stable/c/3c3433657c82f200dae36c29e2b80681c81b85be"},{"url":"https://git.kernel.org/stable/c/65e05ec252a9b79e75930d3c4dd42d8877db04c5"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00168,"epssPercentile":0.0602,"ingestedAt":"2026-10-18T15:45:12.296Z","slug":"CVE-2026-98473","body":"## Overview\n\nA flaw was found in the Linux kernel's s390 Virtual Function I/O Adjunct Processor (VFIO-AP) device driver. A local user with administrative privileges can trigger this issue by removing an AP queue from the host configuration while it remains assigned to an active virtual machine. Because the driver does not properly clean up device resources when the hardware is no longer available, pinned memory pages and interrupt registrations are leaked, and subsequent cleanup attempts may cause a double-free condition. This flaw can lead to memory exhaustion, kernel instability, or a Denial of Service (DoS).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98473.json)\n\n**kernel: s390/vfio-ap: fix KVM GISC and page leak when queue removed from host config** — rated Low by Red Hat. Released 2026-10-18, updated 2026-10-20.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":10,"depthScoreParts":{"impact":10.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225662,"id":"CVE-2026-98473","ts":1792498345461,"field":"cvss","old":null,"new":"1.9"},{"seq":225661,"id":"CVE-2026-98473","ts":1792498345461,"field":"severity","old":"none","new":"low"}]}