---
title: "CVE-2026-89513: Linux Kernel KVM - Out-of-Bounds Read/Write"
description: "Linux kernel KVM on RISC-V contains an out-of-bounds read/write caused by incorrect PMU event info array size calculation in kvm_riscv_vcpu_pmu_event_info, letting nested guest attackers cause memory corruption, exploit requires nested guest access."
url: https://panop.io/threat-heartbeat/CVE-2026-89513/
---

# CVE-2026-89513 Linux Kernel KVM - Out-of-Bounds Read/Write

Linux kernel KVM on RISC-V contains an out-of-bounds read/write caused by incorrect PMU event info array size calculation in kvm\_riscv\_vcpu\_pmu\_event\_info, letting nested guest attackers cause memory corruption, exploit requires nested guest access.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89513)

## Details

Type

Out-of-Bounds Read/Write

Impact

Denial Of Service, Data Tampering

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for PMU event info array size overflow.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89513](https://nvd.nist.gov/vuln/detail/CVE-2026-89513)
- [https://git.kernel.org/stable/c/735bc20c24187ca419c9d5e63860a54b91be34bd](https://git.kernel.org/stable/c/735bc20c24187ca419c9d5e63860a54b91be34bd)
- [https://git.kernel.org/stable/c/82088f88c96b99c27a974d09b02c2b133262fadf](https://git.kernel.org/stable/c/82088f88c96b99c27a974d09b02c2b133262fadf)
- [https://git.kernel.org/stable/c/ddbd71a3780942918a7d116d666313e5b3304d73](https://git.kernel.org/stable/c/ddbd71a3780942918a7d116d666313e5b3304d73)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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