Provide references for CVE-2017-18221.
Where can I find more information about CVE-2017-18221?
References are available at: https://github.com/torvalds/linux/commit/70feee0e1ef331b22cc51f383d532a0d043fbdcc, https://usn.ubuntu.com/3655-1/, http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=70feee0e1ef331b22cc51f383d532a0d043fbdcc, https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.11.4, https://usn.ubuntu.com/3655-2/, http://www.securityfocus.com/bid/103321.