---
title: "CVE-2026-89914: Linux Kernel KVM arm64 - Memory Management Vulnerability"
description: "Linux kernel contains a sign extension omission vulnerability in KVM arm64 decode_range_tlbi helper for range-based TLBI invalidation, letting attackers cause potential memory management issues, exploit requires specific usage of S2 invalidation."
url: https://panop.io/threat-heartbeat/CVE-2026-89914/
---

# CVE-2026-89914 Linux Kernel KVM arm64 - Memory Management Vulnerability

Linux kernel contains a sign extension omission vulnerability in KVM arm64 decode\_range\_tlbi helper for range-based TLBI invalidation, letting attackers cause potential memory management issues, exploit requires specific usage of S2 invalidation.

CVSS base score 9.3 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.19% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89914)

## Details

Type

Memory Management Vulnerability

Impact

Denial Of Service, Privilege Escalation

CVSS vector

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

Published

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for decode\_range\_tlbi sign extension.

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-2026-89914](https://nvd.nist.gov/vuln/detail/CVE-2026-89914)
- [https://git.kernel.org/stable/c/2393470085649f0b973ecceb26fe8fc71edde0c1](https://git.kernel.org/stable/c/2393470085649f0b973ecceb26fe8fc71edde0c1)
- [https://git.kernel.org/stable/c/3feb83918e30f0472e058224b926ebfe8a064fac](https://git.kernel.org/stable/c/3feb83918e30f0472e058224b926ebfe8a064fac)
- [https://git.kernel.org/stable/c/72bce82c4171bf330919ff1b64dc0a36c254ec7d](https://git.kernel.org/stable/c/72bce82c4171bf330919ff1b64dc0a36c254ec7d)

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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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