Provide references for CVE-2017-13721.
Where can I find more information about CVE-2017-13721?
References are available at: https://cgit.freedesktop.org/xorg/xserver/commit/?id=b95f25af141d33a65f6f821ea9c003f66a01e1f1, https://security.gentoo.org/glsa/201710-30, http://www.openwall.com/lists/oss-security/2017/10/04/10, http://www.securityfocus.com/bid/101238, http://www.debian.org/security/2017/dsa-4000, https://lists.x.org/archives/xorg-announce/2017-October/002808.html.