---
title: "CVE-2026-90227: Linux Kernel - Broken Access Control"
description: "Linux kernel contains a broken access control vulnerability caused by NVME_IOCTL_SUBMIT_IO ioctl not checking command permissions with nvme_cmd_allowed(), letting unprivileged attackers perform unauthorized I/O on partition devices or write through read-only descriptors, exploit requires unprivileged access."
url: https://panop.io/threat-heartbeat/CVE-2026-90227/
---

# CVE-2026-90227 Linux Kernel - Broken Access Control

Linux kernel contains a broken access control vulnerability caused by NVME\_IOCTL\_SUBMIT\_IO ioctl not checking command permissions with nvme\_cmd\_allowed(), letting unprivileged attackers perform unauthorized I/O on partition devices or write through read-only descriptors, exploit requires unprivileged access.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90227)

## Details

Type

Broken Access Control

Impact

Broken Access Control, Data Tampering

CVSS vector

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

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with the patch for nvme\_cmd\_allowed() checks.

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-2026-90227](https://nvd.nist.gov/vuln/detail/CVE-2026-90227)
- [https://git.kernel.org/stable/c/736b7c6adc7a65c4411beff197b6a634f7a6ca27](https://git.kernel.org/stable/c/736b7c6adc7a65c4411beff197b6a634f7a6ca27)
- [https://git.kernel.org/stable/c/95b0591d51dbf9e618d7845883d535e88ad7c8af](https://git.kernel.org/stable/c/95b0591d51dbf9e618d7845883d535e88ad7c8af)
- [https://git.kernel.org/stable/c/b116e9dae433ff631f94c36c61a7a78fe400ed1e](https://git.kernel.org/stable/c/b116e9dae433ff631f94c36c61a7a78fe400ed1e)
- [https://git.kernel.org/stable/c/b53d495c7f0db46b6748b5ade48371a10dd5d3bc](https://git.kernel.org/stable/c/b53d495c7f0db46b6748b5ade48371a10dd5d3bc)
- [https://git.kernel.org/stable/c/c35cd98eed1a863e8dd51073953563cd8c907f68](https://git.kernel.org/stable/c/c35cd98eed1a863e8dd51073953563cd8c907f68)

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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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