---
title: "CVE-2026-89929: Linux Kernel KVM - Information Disclosure"
description: "Linux kernel KVM nested virtualization contains a logic flaw in INVVPID emulation causing TLB invalidation on incorrect physical CPU, letting attackers cause stale TLB entries, exploit requires nested virtualization and CPU migration."
url: https://panop.io/threat-heartbeat/CVE-2026-89929/
---

# CVE-2026-89929 Linux Kernel KVM - Information Disclosure

Linux kernel KVM nested virtualization contains a logic flaw in INVVPID emulation causing TLB invalidation on incorrect physical CPU, letting attackers cause stale TLB entries, exploit requires nested virtualization and CPU migration.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89929)

## Details

Type

Information Disclosure

Impact

Information Disclosure

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/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 INVVPID emulation on correct physical CPU.

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-2026-89929](https://nvd.nist.gov/vuln/detail/CVE-2026-89929)
- [https://git.kernel.org/stable/c/d03e721801ac54b9fdf05668aa0c069f07913b68](https://git.kernel.org/stable/c/d03e721801ac54b9fdf05668aa0c069f07913b68)
- [https://git.kernel.org/stable/c/27bdeb5fd19046ffba9ff234e92fe553eb2efb30](https://git.kernel.org/stable/c/27bdeb5fd19046ffba9ff234e92fe553eb2efb30)
- [https://git.kernel.org/stable/c/6d00e67326d831e6e610933a3800712f4ffe6ec1](https://git.kernel.org/stable/c/6d00e67326d831e6e610933a3800712f4ffe6ec1)
- [https://git.kernel.org/stable/c/9941850e8adf164d005dbd3774c4b79e91a3cb8e](https://git.kernel.org/stable/c/9941850e8adf164d005dbd3774c4b79e91a3cb8e)

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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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