{"id":"CVE-2026-98863","title":"kernel: KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails (CVE-2026-98863)","summary":"A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem. When running nested virtual machines, the hypervisor fails to properly re-queue a memory page request if retrieving state pages for a nested guest fails d…","severity":"medium","cvss":5.6,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-825","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-10-18","updated":"2026-10-24","sourceUpdated":"2026-10-24T06:44:56+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98863.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98863.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98863"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555217"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98863"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98863"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98863.mbox"},{"url":"https://git.kernel.org/stable/c/525694a6021ec6c8f7ce1f38acdf2dd77698fec1"},{"url":"https://git.kernel.org/stable/c/942192dbcd3a06695ef6b31cf10a41a21cf014d8"},{"url":"https://git.kernel.org/stable/c/10180a277549339020b08000206092c07e0bff5a"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00154,"epssPercentile":0.0452,"ingestedAt":"2026-10-18T16:47:32.458Z","slug":"CVE-2026-98863","body":"## Overview\n\nA flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem. When running nested virtual machines, the hypervisor fails to properly re-queue a memory page request if retrieving state pages for a nested guest fails during execution. A local user controlling virtual machine processes could exploit this flaw by resuming virtual CPU execution, causing the hypervisor to re-enter the nested guest using stale memory references. This issue primarily leads to a Denial of Service (DoS) through hypervisor memory corruption or system crashes.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98863.json)\n\n**kernel: KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-24.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 7\n\n## Remediation\n\nOut of support scope","depth":"sunlit","depthScore":31,"depthScoreParts":{"impact":30.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228524,"id":"CVE-2026-98863","ts":1792844774052,"field":"cvss","old":null,"new":"5.6"},{"seq":228523,"id":"CVE-2026-98863","ts":1792844774052,"field":"severity","old":"none","new":"medium"}]}