CVE-2026-98749

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

tty: serial: max3100: shut down timer before freeing port

max3100 shutdown() stops the polling timer but returns early during system suspend. If the SPI device is unbound before resume, the serial core does not call max3100 shutdown() again, so max3100 remove() frees the port while the timer remains armed. max3100 timeout() may then access the freed port and re-arm the timer.

Add final timer teardown to max3100 remove() and use timer shutdown sync() to prevent a racing callback from re-arming it. Also free the IRQ and destroy the workqueue there before freeing the port. Keep timer delete sync() in max3100 shutdown() so that a subsequent open() can re-arm the timer.

The workqueue is created before request irq() and destroyed on both request irq() failure and normal shutdown. Its presence at remove thus identifies the IRQ left registered when suspend bypasses shutdown.

Free the IRQ before destroying the workqueue, in both max3100 shutdown() and max3100 remove(), and cancel the pending work in between. free irq() waits for a running interrupt handler to finish and no new handler can start afterwards, so a racing handler cannot queue work on a workqueue that is being destroyed; the force end work check in max3100 dowork() only narrows that window, as a handler delayed between the check and queue work() could still run after the teardown has cleared the workqueue pointer. Cancelling the work also keeps destroy workqueue() from waiting on a queued work item in case remove() ever runs while the freezable workqueue is still frozen, e.g. device removal during the resume window, before workqueues are thawed.

This issue was found by an in-house static analysis tool.