The sctp_sf_do_5_1D_ce function in net/sctp/sm_statefuns.c in the Linux kernel through 3.13.6 does not validate certain auth_enable and auth_capable fields before making an sctp_sf_authenticate call, which allows remote attackers to cause a denial of service (NULL pointer dereference and system crash) via an SCTP handshake with a modified INIT chunk and a crafted AUTH chunk before a COOKIE_ECHO chunk.
https://github.com/torvalds/linux/commit/ec0223ec48a90cb605244b45f7c62de856403729
https://bugzilla.redhat.com/show_bug.cgi?id=1070705
http://www.ubuntu.com/usn/USN-2174-1
http://www.ubuntu.com/usn/USN-2173-1
http://www.securityfocus.com/bid/65943
http://www.openwall.com/lists/oss-security/2014/03/04/6
http://support.f5.com/kb/en-us/solutions/public/15000/300/sol15317.html
http://secunia.com/advisories/59216
http://rhn.redhat.com/errata/RHSA-2014-0432.html
http://rhn.redhat.com/errata/RHSA-2014-0419.html