---
title: "CVE-2026-89920: Linux Kernel KVM s390 - Memory Corruption"
description: "Linux kernel KVM s390 contains a memory corruption vulnerability caused by reinjecting CK machine checks into the guest, letting attackers cause memory corruption, exploit requires use of KVM on s390 architecture."
url: https://panop.io/threat-heartbeat/CVE-2026-89920/
---

# CVE-2026-89920 Linux Kernel KVM s390 - Memory Corruption

Linux kernel KVM s390 contains a memory corruption vulnerability caused by reinjecting CK machine checks into the guest, letting attackers cause memory corruption, exploit requires use of KVM on s390 architecture.

CVSS base score 7.8 /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-2026-89920)

## Details

Type

Memory Corruption

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:H/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.

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-2026-89920](https://nvd.nist.gov/vuln/detail/CVE-2026-89920)
- [https://git.kernel.org/stable/c/546dde823a36d7283dcf46127c2f3d093443860f](https://git.kernel.org/stable/c/546dde823a36d7283dcf46127c2f3d093443860f)
- [https://git.kernel.org/stable/c/6ee52d3af2a1bf70349cf3f860933c8d221e229a](https://git.kernel.org/stable/c/6ee52d3af2a1bf70349cf3f860933c8d221e229a)
- [https://git.kernel.org/stable/c/7077ec953996acc04b49d1dfc43df1c1a2a74395](https://git.kernel.org/stable/c/7077ec953996acc04b49d1dfc43df1c1a2a74395)

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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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