net/netfilter/nf_conntrack_proto_generic.c in the Linux kernel before 3.18 generates incorrect conntrack entries during handling of certain iptables rule sets for the SCTP, DCCP, GRE, and UDP-Lite protocols, which allows remote attackers to bypass intended access restrictions via packets with disallowed port numbers.
https://github.com/torvalds/linux/commit/db29a9508a9246e77087c5531e45b2c88ec6988b
https://bugzilla.redhat.com/show_bug.cgi?id=1182059
http://www.ubuntu.com/usn/USN-2518-1
http://www.ubuntu.com/usn/USN-2517-1
http://www.ubuntu.com/usn/USN-2516-1
http://www.ubuntu.com/usn/USN-2515-1
http://www.ubuntu.com/usn/USN-2514-1
http://www.ubuntu.com/usn/USN-2513-1
http://www.spinics.net/lists/netfilter-devel/msg33430.html
http://www.securityfocus.com/bid/72061
http://www.openwall.com/lists/oss-security/2015/01/14/3
http://www.mandriva.com/security/advisories?name=MDVSA-2015:058
http://www.mandriva.com/security/advisories?name=MDVSA-2015:057
http://www.debian.org/security/2015/dsa-3170
http://rhn.redhat.com/errata/RHSA-2015-0674.html
http://rhn.redhat.com/errata/RHSA-2015-0290.html
http://rhn.redhat.com/errata/RHSA-2015-0284.html
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00015.html
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00020.html