CVE-2026-89769
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.
How to fix
- Linux Linuxd53c29a89a15e56a1797f3ef249955e544782e04, cdcd861123248e871c2ec2be968b0a1b2a5a34b0, 05520e035f8332c8e33f3011b5ca016fde61793d or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | bee33f22d7c30626e711b4900e3f460b6e0e104f ≤ v < d53c29a89a15e56a1797f3ef249955e544782e04, bee33f22d7c30626e711b4900e3f460b6e0e104f ≤ v < cdcd861123248e871c2ec2be968b0a1b2a5a34b0, bee33f22d7c30626e711b4900e3f460b6e0e104f ≤ v < 05520e035f8332c8e33f3011b5ca016fde61793d, 6.18 | d53c29a89a15e56a1797f3ef249955e544782e04, cdcd861123248e871c2ec2be968b0a1b2a5a34b0, 05520e035f8332c8e33f3011b5ca016fde61793d |
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