---
title: "CVE-2026-90003: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in futex subsystem caused by race condition during FUTEX_CMP_REQUEUE_PI handling on PREEMPT_RT, letting local attackers cause kernel memory corruption, exploit requires concurrent futex operations."
url: https://panop.io/threat-heartbeat/CVE-2026-90003/
---

# CVE-2026-90003 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in futex subsystem caused by race condition during FUTEX\_CMP\_REQUEUE\_PI handling on PREEMPT\_RT, letting local attackers cause kernel memory corruption, exploit requires concurrent futex operations.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.16% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90003)

## Details

Type

Use After Free

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

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for futex requeue PI race condition.

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-2026-90003](https://nvd.nist.gov/vuln/detail/CVE-2026-90003)
- [https://git.kernel.org/stable/c/220ee9e04ca3b7f014c000264aa6c884f036c86e](https://git.kernel.org/stable/c/220ee9e04ca3b7f014c000264aa6c884f036c86e)
- [https://git.kernel.org/stable/c/244f301759fd34b1dd0b4192ce44f8ef224e027d](https://git.kernel.org/stable/c/244f301759fd34b1dd0b4192ce44f8ef224e027d)
- [https://git.kernel.org/stable/c/7d1559126d86be6e4f6a85663dfbfe85caa47e37](https://git.kernel.org/stable/c/7d1559126d86be6e4f6a85663dfbfe85caa47e37)
- [https://git.kernel.org/stable/c/81aadbd09bf1dcd3238212f336ba699503557ae8](https://git.kernel.org/stable/c/81aadbd09bf1dcd3238212f336ba699503557ae8)
- [https://git.kernel.org/stable/c/a3b8d46fe401cba3a5c46dea610e6eb3dc15370e](https://git.kernel.org/stable/c/a3b8d46fe401cba3a5c46dea610e6eb3dc15370e)
- [https://git.kernel.org/stable/c/e4a4ccfa470f910b747b3ee8d18670ed8ac8a236](https://git.kernel.org/stable/c/e4a4ccfa470f910b747b3ee8d18670ed8ac8a236)

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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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