fs/f2fs/extent_cache.c in the Linux kernel before 4.13 mishandles extent trees, which allows local users to cause a denial of service (BUG) via an application with multiple threads.
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=dad48e73127ba10279ea33e6dbc8d3905c4d31c0
www.securityfocus.com/bid/103147
github.com/torvalds/linux/commit/dad48e73127ba10279ea33e6dbc8d3905c4d31c0
usn.ubuntu.com/3654-1/
usn.ubuntu.com/3654-2/
usn.ubuntu.com/3656-1/
www.debian.org/security/2018/dsa-4188