The udp6_ufo_fragment function in net/ipv6/udp_offload.c in the Linux kernel through 3.12, when UDP Fragmentation Offload (UFO) is enabled, does not properly perform a certain size comparison before inserting a fragment header, which allows remote attackers to cause a denial of service (panic) via a large IPv6 UDP packet, as demonstrated by use of the Token Bucket Filter (TBF) queueing discipline.
http://lists.opensuse.org/opensuse-security-announce/2014-02/msg00003.html
https://bugzilla.redhat.com/show_bug.cgi?id=1030015
https://github.com/torvalds/linux/commit/0e033e04c2678dbbe74a46b23fffb7bb918c288e
http://www.openwall.com/lists/oss-security/2013/11/13/9