---
title: "CVE-2026-90143: Linux Kernel - Broken Authentication"
description: "Linux kernel contains a broken authentication caused by missing RCU read lock in kcm_parse_func_strparser during BPF parser execution, letting attackers trigger kernel warnings and potential instability, exploit requires kernel-level code execution."
url: https://panop.io/threat-heartbeat/CVE-2026-90143/
---

# CVE-2026-90143 Linux Kernel - Broken Authentication

Linux kernel contains a broken authentication caused by missing RCU read lock in kcm\_parse\_func\_strparser during BPF parser execution, letting attackers trigger kernel warnings and potential instability, exploit requires kernel-level code execution.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.18% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90143)

## Details

Type

Broken Authentication

Impact

Denial Of Service, Privilege Escalation

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 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-2026-90143](https://nvd.nist.gov/vuln/detail/CVE-2026-90143)
- [https://git.kernel.org/stable/c/3c70d27e792a28bca650ddd8a9aa0fe3591ffec5](https://git.kernel.org/stable/c/3c70d27e792a28bca650ddd8a9aa0fe3591ffec5)
- [https://git.kernel.org/stable/c/b0346dd64e4905291cc9c479f2e6cf1884ced4e6](https://git.kernel.org/stable/c/b0346dd64e4905291cc9c479f2e6cf1884ced4e6)
- [https://git.kernel.org/stable/c/b0e94ea63dbdcbfec9beb819cd5f8fa584809ef2](https://git.kernel.org/stable/c/b0e94ea63dbdcbfec9beb819cd5f8fa584809ef2)
- [https://git.kernel.org/stable/c/f392affef3c9ce64dfdde794df0579e0a7793440](https://git.kernel.org/stable/c/f392affef3c9ce64dfdde794df0579e0a7793440)
- [https://git.kernel.org/stable/c/1d26a6e007d46babc7fa76e5a157dccf86cd55c0](https://git.kernel.org/stable/c/1d26a6e007d46babc7fa76e5a157dccf86cd55c0)
- [https://git.kernel.org/stable/c/21526f8a191a3c50622b8c10bd927870d780eae4](https://git.kernel.org/stable/c/21526f8a191a3c50622b8c10bd927870d780eae4)
- [https://git.kernel.org/stable/c/292846223eaddba890e40699d2ab82ee5671798c](https://git.kernel.org/stable/c/292846223eaddba890e40699d2ab82ee5671798c)
- [https://git.kernel.org/stable/c/37108861cf7bd909d4a372069bcd61c8f489e232](https://git.kernel.org/stable/c/37108861cf7bd909d4a372069bcd61c8f489e232)

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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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