---
title: "CVE-2026-89911: Linux Kernel KVM arm64 - Denial of Service"
description: "Linux kernel KVM arm64 contains a vulnerability caused by improper capping of TLB Invalidation by Range, letting guest attackers cause overflow by encoding large ranges, exploit requires running guest VM."
url: https://panop.io/threat-heartbeat/CVE-2026-89911/
---

# CVE-2026-89911 Linux Kernel KVM arm64 - Denial of Service

Linux kernel KVM arm64 contains a vulnerability caused by improper capping of TLB Invalidation by Range, letting guest attackers cause overflow by encoding large ranges, exploit requires running guest VM.

CVSS base score 7.9 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.16% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89911)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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

Published

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with the fix for KVM arm64 TLB range capping.

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-2026-89911](https://nvd.nist.gov/vuln/detail/CVE-2026-89911)
- [https://git.kernel.org/stable/c/69a598288195947a1662b53de702eb6976af96b7](https://git.kernel.org/stable/c/69a598288195947a1662b53de702eb6976af96b7)
- [https://git.kernel.org/stable/c/2de38f0448b45d27eba984fc0d9edb7a138972c2](https://git.kernel.org/stable/c/2de38f0448b45d27eba984fc0d9edb7a138972c2)
- [https://git.kernel.org/stable/c/566b1f08d983615f731cc693f2ad59db302c6b57](https://git.kernel.org/stable/c/566b1f08d983615f731cc693f2ad59db302c6b57)

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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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