---
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'
---

## Overview

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 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.

## Vendor advisories

- **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)

**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.

Affected:

- Red Hat Enterprise Linux 10

No fix planned:

- Red Hat Enterprise Linux 10

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Fix deferred