---
id: CVE-2026-98464
title: >-
  kernel: RISC-V: KVM: Synchronize hrtimer callback during teardown
  (CVE-2026-98464)
summary: >-
  A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine)
  implementation for the RISC-V architecture. This vulnerability can lead to a
  Denial of Service (DoS) or host system crash due to a use-after-free memory
  issue during…
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: Linux
affected:
  - >-
    Linux >= 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 <
    9bdbae64ae0dab93041ebc57ec4e93def793fc2d
  - >-
    Linux >= 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 <
    2af03b606aadaaeb386658ef798c79bdcdef87c1
  - >-
    Linux >= 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 <
    e66aced74f0122380603c9910a71d77618b28f0e
  - >-
    Linux >= 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 <
    ea91f05a55b807ead3166546a2c75f4185ca645f
  - >-
    Linux >= 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 <
    3cc6184bd5920c9685d87f4e260568feba08650d
  - >-
    Linux >= 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 <
    aaad136d56d91252517272b68cd533e5714698d5
  - Linux 5.16
published: '2026-10-18'
updated: '2026-10-24'
sourceUpdated: '2026-10-24T14:27:44+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98464.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98464.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98464'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2554828'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98464'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98464'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98464.mbox
  - url: 'https://git.kernel.org/stable/c/9bdbae64ae0dab93041ebc57ec4e93def793fc2d'
  - url: 'https://git.kernel.org/stable/c/2af03b606aadaaeb386658ef798c79bdcdef87c1'
  - url: 'https://git.kernel.org/stable/c/e66aced74f0122380603c9910a71d77618b28f0e'
  - url: 'https://git.kernel.org/stable/c/ea91f05a55b807ead3166546a2c75f4185ca645f'
  - url: 'https://git.kernel.org/stable/c/3cc6184bd5920c9685d87f4e260568feba08650d'
  - url: 'https://git.kernel.org/stable/c/aaad136d56d91252517272b68cd533e5714698d5'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00143
epssPercentile: 0.03573
scores:
  vendor: 5.6
  cna: 9.3
ingestedAt: '2026-10-18T15:45:12.300Z'
---

## Overview

A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) implementation for the RISC-V architecture. This vulnerability can lead to a Denial of Service (DoS) or host system crash due to a use-after-free memory issue during virtual machine teardown. A race condition allows a timer callback to continue executing after its associated virtual central processing unit (vCPU) has already been freed. A malicious user within a guest virtual machine can exploit this by scheduling a timer and immediately requesting a system shutdown.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98464.json)

**kernel: RISC-V: KVM: Synchronize hrtimer callback during teardown** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-24.

Not affected:

- Red Hat Enterprise Linux 10
- 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

Refer to the advisory for fix availability.