---
title: "CVE-2026-90401: Linux Kernel md - Data Integrity & Availability Impact"
description: "Linux kernel md subsystem removes REQ_NOWAIT support from raid1, raid10, and raid456 due to incomplete handling causing potential data divergence on write failures, letting attackers cause data inconsistency, exploit requires ability to trigger writes on affected RAID levels."
url: https://panop.io/threat-heartbeat/CVE-2026-90401/
---

# CVE-2026-90401 Linux Kernel md - Data Integrity & Availability Impact

Linux kernel md subsystem removes REQ\_NOWAIT support from raid1, raid10, and raid456 due to incomplete handling causing potential data divergence on write failures, letting attackers cause data inconsistency, exploit requires ability to trigger writes on affected RAID levels.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.15% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90401)

## Details

Type

Data Integrity

Impact

Data Tampering, Denial Of Service

CVSS vector

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

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to a Linux kernel version that removes REQ\_NOWAIT support from raid1, raid10, and raid456.

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-2026-90401](https://nvd.nist.gov/vuln/detail/CVE-2026-90401)
- [https://git.kernel.org/stable/c/3fe5b7c9fb72ccc29bfd0f955b124892af7e3674](https://git.kernel.org/stable/c/3fe5b7c9fb72ccc29bfd0f955b124892af7e3674)
- [https://git.kernel.org/stable/c/9bb9504e2d8f3d22ef12d51c333dd499f402dc8f](https://git.kernel.org/stable/c/9bb9504e2d8f3d22ef12d51c333dd499f402dc8f)
- [https://git.kernel.org/stable/c/ffcc9ea4e4d121c78aef6654a1577aa7d120774d](https://git.kernel.org/stable/c/ffcc9ea4e4d121c78aef6654a1577aa7d120774d)

[← All CVEs](https://panop.io/threat-heartbeat/)

## 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

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)