The add_probe function in modutils/modprobe.c in BusyBox before 1.23.0 allows local users to bypass intended restrictions on loading kernel modules via a / (slash) character in a module name, as demonstrated by an “ifconfig /usbserial up” command or a “mount -t /snd_pcm none /” command.
git.busybox.net/busybox/commit/?id=4e314faa0aecb66717418e9a47a4451aec59262b
openwall.com/lists/oss-security/2015/01/24/4
seclists.org/fulldisclosure/2020/Mar/15
www.securityfocus.com/bid/72324
bugs.busybox.net/show_bug.cgi?id=7652
bugzilla.redhat.com/show_bug.cgi?id=1185707
lists.debian.org/debian-lts-announce/2018/07/msg00037.html
plus.google.com/+MathiasKrause/posts/PqFCo4bfrWu
security.gentoo.org/glsa/201503-13
usn.ubuntu.com/3935-1/