---
title: "CVE-2026-89762: Linux Kernel AppArmor - Use After Free"
description: "Linux kernel AppArmor contains a use-after-free vulnerability caused by improper cred replacement in begin_current_label_crit_section(), letting attackers cause UAF via out-of-sync credentials during LSM hooks, exploit requires specific task cred override conditions."
url: https://panop.io/threat-heartbeat/CVE-2026-89762/
---

# CVE-2026-89762 Linux Kernel AppArmor - Use After Free

Linux kernel AppArmor contains a use-after-free vulnerability caused by improper cred replacement in begin\_current\_label\_crit\_section(), letting attackers cause UAF via out-of-sync credentials during LSM hooks, exploit requires specific task cred override conditions.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.12% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89762)

## 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

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the AppArmor fix for cred UAF in begin\_current\_label\_crit\_section().

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-2026-89762](https://nvd.nist.gov/vuln/detail/CVE-2026-89762)
- [https://git.kernel.org/stable/c/361488984d668235438faac28635f3632351407f](https://git.kernel.org/stable/c/361488984d668235438faac28635f3632351407f)
- [https://git.kernel.org/stable/c/3f4ae5fab613dca01d6a2a8210dd832e009fcf47](https://git.kernel.org/stable/c/3f4ae5fab613dca01d6a2a8210dd832e009fcf47)
- [https://git.kernel.org/stable/c/580f777d6d9fd07fc034bd1aeba5c30fd48871a2](https://git.kernel.org/stable/c/580f777d6d9fd07fc034bd1aeba5c30fd48871a2)
- [https://git.kernel.org/stable/c/587a6a92b93ec314c583bbf747413af170d42540](https://git.kernel.org/stable/c/587a6a92b93ec314c583bbf747413af170d42540)

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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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