{"id":"CVE-2026-98470","title":"kernel: KVM: arm64: Don't WARN on an unknown VM ioctl in protected mode (CVE-2026-98470)","summary":"A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem for ARM64. This vulnerability allows a local attacker to cause a Denial of Service (DoS). When running in protected mode, the kernel issues an internal war…","severity":"medium","cvss":4.7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-617","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10"],"published":"2026-10-18","updated":"2026-10-20","sourceUpdated":"2026-10-20T09:36:21+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98470.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98470.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98470"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554837"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98470"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98470"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98470.mbox"},{"url":"https://git.kernel.org/stable/c/cc53eb5c6515e3221314624a22c9da9c80a67f63"},{"url":"https://git.kernel.org/stable/c/49d9d295d69d07e850cae35933ba8519e2915f26"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00155,"epssPercentile":0.0464,"ingestedAt":"2026-10-18T15:45:12.297Z","slug":"CVE-2026-98470","body":"## Overview\n\nA flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem for ARM64. This vulnerability allows a local attacker to cause a Denial of Service (DoS). When running in protected mode, the kernel issues an internal warning upon receiving an unknown virtual machine I/O control (IOCTL) command from userspace. On hosts configured to panic on kernel warnings, this causes the host operating system to crash.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98470.json)\n\n**kernel: KVM: arm64: Don't WARN on an unknown VM ioctl in protected mode** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-20.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\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":26,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225671,"id":"CVE-2026-98470","ts":1792498348687,"field":"cvss","old":null,"new":"4.7"},{"seq":225670,"id":"CVE-2026-98470","ts":1792498348687,"field":"severity","old":"none","new":"medium"}]}