An issue was discovered in fs/f2fs/super.c in the Linux kernel through 4.14. A denial of service (out-of-bounds memory access and BUG) can occur upon encountering an abnormal bitmap size when mounting a crafted f2fs image.
https://usn.ubuntu.com/4118-1/
https://usn.ubuntu.com/4094-1/
https://usn.ubuntu.com/3821-2/
https://usn.ubuntu.com/3821-1/
https://seclists.org/bugtraq/2019/Jan/52
https://lists.debian.org/debian-lts-announce/2019/03/msg00017.html
https://bugzilla.kernel.org/show_bug.cgi?id=200167
http://lists.opensuse.org/opensuse-security-announce/2018-10/msg00033.html