In the Linux kernel, the following vulnerability has been resolved:
ALSA: hda: Fix UAF of leds class devs at unbinding
The LED class devices that are created by HD-audio codec drivers are registered via devmledclassdevregister() and associated with the HD-audio codec device. Unfortunately, it turned out that the devres release doesn't work for this case; namely, since the codec resource release happens before the devm call chain, it triggers a NULL dereference or a UAF for a stale setbrightness_delay callback.
For fixing the bug, this patch changes the LED class device register and unregister in a manual manner without devres, keeping the instances in hdagenspec.