In the Linux kernel before 5.4.16, a race condition in tty->disc_data handling in the slip and slcan line discipline could lead to a use-after-free, aka CID-0ace17d56824. This affects drivers/net/slip/slip.c and drivers/net/can/slcan.c.
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.16
https://bugzilla.suse.com/show_bug.cgi?id=1162002
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.html