---
title: "CVE-2026-89769: Linux kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability caused by an IRQ leak on cpuhp_setup_state error path in clocksource/drivers/nxp-pit, letting attackers potentially trigger use-after-free via IRQ firing, exploit requires kernel IRQ handling."
url: https://panop.io/threat-heartbeat/CVE-2026-89769/
---

# CVE-2026-89769 Linux kernel - Use After Free

Linux kernel contains a use-after-free vulnerability caused by an IRQ leak on cpuhp\_setup\_state error path in clocksource/drivers/nxp-pit, letting attackers potentially trigger use-after-free via IRQ firing, exploit requires kernel IRQ handling.

CVSS base score 7.4 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89769)

## Details

Type

Use After Free

Impact

Use After Free, Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:N/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 fix for IRQ leak in nxp-pit driver.

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-2026-89769](https://nvd.nist.gov/vuln/detail/CVE-2026-89769)
- [https://git.kernel.org/stable/c/d53c29a89a15e56a1797f3ef249955e544782e04](https://git.kernel.org/stable/c/d53c29a89a15e56a1797f3ef249955e544782e04)
- [https://git.kernel.org/stable/c/05520e035f8332c8e33f3011b5ca016fde61793d](https://git.kernel.org/stable/c/05520e035f8332c8e33f3011b5ca016fde61793d)
- [https://git.kernel.org/stable/c/cdcd861123248e871c2ec2be968b0a1b2a5a34b0](https://git.kernel.org/stable/c/cdcd861123248e871c2ec2be968b0a1b2a5a34b0)

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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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