---
title: "CVE-2026-89558: Linux Kernel md/raid10 - Data Corruption"
description: "Linux kernel md/raid10 contains a logic error caused by incorrect boolean assignment in raid10_sync_request(), letting attackers cause silent data corruption during device recovery, exploit requires degraded RAID10 array with device failure."
url: https://panop.io/threat-heartbeat/CVE-2026-89558/
---

# CVE-2026-89558 Linux Kernel md/raid10 - Data Corruption

Linux kernel md/raid10 contains a logic error caused by incorrect boolean assignment in raid10\_sync\_request(), letting attackers cause silent data corruption during device recovery, exploit requires degraded RAID10 array with device failure.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.64% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89558)

## Details

Type

Data Corruption

Impact

Data Tampering

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the Linux kernel version containing the fix for commit fe6a19d40ceb or later.

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-2026-89558](https://nvd.nist.gov/vuln/detail/CVE-2026-89558)
- [https://git.kernel.org/stable/c/00449d752bee9c8787f42ea1bf533a9fb17f9b6b](https://git.kernel.org/stable/c/00449d752bee9c8787f42ea1bf533a9fb17f9b6b)
- [https://git.kernel.org/stable/c/0efabe6229dc683dbf6eeebd0f9fddc7971ed420](https://git.kernel.org/stable/c/0efabe6229dc683dbf6eeebd0f9fddc7971ed420)
- [https://git.kernel.org/stable/c/47f1441b281decde6954a2fa82b4131637d685ac](https://git.kernel.org/stable/c/47f1441b281decde6954a2fa82b4131637d685ac)
- [https://git.kernel.org/stable/c/9bb8da6ecb330a5b1ac9b96f1e55f134a7aef1d4](https://git.kernel.org/stable/c/9bb8da6ecb330a5b1ac9b96f1e55f134a7aef1d4)

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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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