CVE-2026-99050 is a vulnerability in Linux Kernel
Published on October 23, 2026
gpio: mpsse: fix race when arming the IRQ poll worker
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.
Products Associated with CVE-2026-99050
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Affected Versions
Linux:- Version 472d900c8bcac301ae0e40fdca7db799bd989ff5 and below 76390ac0bca7e5058b7482eb4d951c3bda5df812 is affected.
- Version 179ef1127d7a4f09f0e741fa9f30b8a8e7886271 and below c0071ee496e1228976c72b096f529503222708a0 is affected.
- Version 179ef1127d7a4f09f0e741fa9f30b8a8e7886271 and below 7efa1a1953cd6b20b23a3524d5b4b81789c6ef25 is affected.
- Version 6.18.6 and below 6.18.57 is affected.
- Version 6.19 is affected.
- Before 6.19 is unaffected.
- Version 6.18.57, <= 6.18.* is unaffected.
- Version 7.2.11, <= 7.2.* is unaffected.
- Version 7.3, <= * is unaffected.