---
id: CVE-2026-89513
title: 'kernel: RISC-V: KVM: Fix PMU event info array size overflow (CVE-2026-89513)'
summary: >-
  A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine)
  component for RISC-V architectures. A malicious guest operating system could
  exploit an integer overflow vulnerability by providing a crafted number of
  Performance M…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-787
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T12:54:16+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89513.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89513.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89513'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532187'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89513'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89513'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89513.mbox
  - url: 'https://git.kernel.org/stable/c/735bc20c24187ca419c9d5e63860a54b91be34bd'
  - url: 'https://git.kernel.org/stable/c/82088f88c96b99c27a974d09b02c2b133262fadf'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00165
epssPercentile: 0.05069
scores:
  vendor: 7
  cna: 8.8
ingestedAt: '2026-09-14T15:23:07.475Z'
---

## Overview

A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) component for RISC-V architectures. A malicious guest operating system could exploit an integer overflow vulnerability by providing a crafted number of Performance Monitoring Unit (PMU) events during the SBI PMU EVENT_GET_INFO call. This leads to KVM allocating insufficient memory, resulting in out-of-bounds reads and writes. This memory corruption could allow a malicious guest to cause a denial of service (DoS) or potentially escalate privileges on the host system.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89513.json)

**kernel: RISC-V: KVM: Fix PMU event info array size overflow** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.

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.