---
title: "CVE-2026-98927: Linux Kernel KVM arm64 - Use After Free"
description: "Linux kernel KVM arm64 contains a use-after-free vulnerability caused by improper lifecycle management of nested_mmus array used for shadow page tables in nested virtualization, letting attackers cause memory corruption during VCPU_INIT, exploit requires running nested L2 guest."
url: https://panop.io/threat-heartbeat/CVE-2026-98927/
---

# CVE-2026-98927 Linux Kernel KVM arm64 - Use After Free

Linux kernel KVM arm64 contains a use-after-free vulnerability caused by improper lifecycle management of nested\_mmus array used for shadow page tables in nested virtualization, letting attackers cause memory corruption during VCPU\_INIT, exploit requires running nested L2 guest.

CVSS base score 7.0 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.21% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-98927)

## Details

Type

Use After Free

Impact

Denial Of Service, Privilege Escalation

CVSS vector

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

Published

23 October 2026

Updated

25 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for nested\_mmus lifecycle.

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-2026-98927](https://nvd.nist.gov/vuln/detail/CVE-2026-98927)
- [https://git.kernel.org/stable/c/33346f8960c7bb6a3b4e273b5cfe25c5a8be349f](https://git.kernel.org/stable/c/33346f8960c7bb6a3b4e273b5cfe25c5a8be349f)
- [https://git.kernel.org/stable/c/512c93f4461b9a3735987f48423d438a9cd49e6a](https://git.kernel.org/stable/c/512c93f4461b9a3735987f48423d438a9cd49e6a)
- [https://git.kernel.org/stable/c/81e3f065a6485626f816d791dfd5e00ddd12eff5](https://git.kernel.org/stable/c/81e3f065a6485626f816d791dfd5e00ddd12eff5)
- [https://git.kernel.org/stable/c/ea242bdc29e8a8ff0e2447a64b3841114779f3af](https://git.kernel.org/stable/c/ea242bdc29e8a8ff0e2447a64b3841114779f3af)

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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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