Linux Kernel nxp-pit Driver: IRQ Leak on cpuhp_setup_state Error Path
CVE-2026-89769 Published on September 11, 2026
clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_state error path
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.
Products Associated with CVE-2026-89769
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Affected Versions
Linux:- Version bee33f22d7c30626e711b4900e3f460b6e0e104f and below d53c29a89a15e56a1797f3ef249955e544782e04 is affected.
- Version bee33f22d7c30626e711b4900e3f460b6e0e104f and below cdcd861123248e871c2ec2be968b0a1b2a5a34b0 is affected.
- Version bee33f22d7c30626e711b4900e3f460b6e0e104f and below 05520e035f8332c8e33f3011b5ca016fde61793d is affected.
- Version 6.18 is affected.
- Before 6.18 is unaffected.
- Version 6.18.50, <= 6.18.* is unaffected.
- Version 7.2.4, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.