# CVE-2026-89769

## Summary

- **CVE ID:** CVE-2026-89769
- **Severity:** HIGH
- **CVSS Score:** 7.4 (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 13, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_state error path

When cpuhp_setup_state fails after pit_clockevent_per_cpu_init has
successfully called request_irq, the error handling jumps directly to
out_pit_clocksource_unregister without freeing the registered IRQ.

This leaks the IRQ line and, since kfree(pit) follows, leaves a
dangling pointer registered as the interrupt handler's dev_id,
potentially leading to a use-after-free if the IRQ fires afterwards.

Fix it by calling pit_clockevent_per_cpu_exit to properly release the
IRQ before falling through to the existing cleanup chain.

## Affected Products

- Linux — Linux (bee33f22d7c30626e711b4900e3f460b6e0e104f)
- Linux — Linux (6.18)
- Linux — Linux (0)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/d53c29a89a15e56a1797f3ef249955e544782e04)
- [CNA](https://git.kernel.org/stable/c/cdcd861123248e871c2ec2be968b0a1b2a5a34b0)
- [CNA](https://git.kernel.org/stable/c/05520e035f8332c8e33f3011b5ca016fde61793d)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.12%
- **EPSS Percentile:** 2.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._