In the Linux kernel through 4.19.6, a local user could exploit a use-after-free in the ALSA driver by supplying a malicious USB Sound device (with zero interfaces) that is mishandled in usb_audio_probe in sound/usb/card.c.
https://usn.ubuntu.com/3933-2/
https://usn.ubuntu.com/3933-1/
https://usn.ubuntu.com/3931-2/
https://usn.ubuntu.com/3931-1/
https://usn.ubuntu.com/3930-2/
https://usn.ubuntu.com/3930-1/
https://usn.ubuntu.com/3879-2/
https://usn.ubuntu.com/3879-1/
https://support.f5.com/csp/article/K98155950
https://lists.debian.org/debian-lts-announce/2019/05/msg00002.html
https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html
https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html
https://github.com/torvalds/linux/commit/5f8cf712582617d523120df67d392059eaf2fc4b
https://bugzilla.suse.com/show_bug.cgi?id=1118152