gpio: mpsse: fix race when arming the IRQ poll worker

Summary

In the Linux kernel, the following vulnerability has been resolved: gpio: mpsse: fix race when arming the IRQ poll worker gpio_mpsse_irq_enable() arms the poll worker before publishing it: schedule_work() runs before the worker is added to priv->workers. If gpio_mpsse_disconnect() walks the list in that window it misses the worker, and once disconnect returns, the USB core frees mpsse_priv while the orphaned gpio_mpsse_poll() work keeps accessing it, causing a use-after-free. Fix this by publishing and arming the worker in one irq_spin critical section. Teardown walks the same list under irq_spin, so a worker found on the list is guaranteed to be armed, and cancel_work_sync() handles it whether it is queued or running. A worker armed after the disconnect walk would still be missed, so also set a new priv->dying flag under irq_spin before the teardown walk, and check it in the same critical section, freeing it via kfree_rcu() instead when the device is going away, since kfree() would be called with the IRQ core's raw spinlock held and may sleep on PREEMPT_RT. schedule_work() is safe to call with irq_spin held, and the next probe gets a fresh mpsse_priv, so the flag never needs to be cleared. This issue was found by an in-house static analysis tool.

Timeline

1. Oct 23, 2026, 12:22 PM UTCCVE published
2. Oct 23, 2026, 12:45 PM UTCFirst seen by cve.now
3. Oct 24, 2026, 2:10 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 472d900c8bcac301ae0e40fdca7db799bd989ff5 · fixed in 76390ac0bca7e5058b7482eb4d951c3bda5df812; From 179ef1127d7a4f09f0e741fa9f30b8a8e7886271 · fixed in c0071ee496e1228976c72b096f529503222708a0; From 179ef1127d7a4f09f0e741fa9f30b8a8e7886271 · fixed in 7efa1a1953cd6b20b23a3524d5b4b81789c6ef25; From 6.18.6 · fixed in 6.18.57

• Linux Linux

  6.19

• KernelLinux

  fixed in 6.18.57; From 6.19.0 · fixed in 7.2.11

References 3