net/ipv6/ip6_output.c in the Linux kernel through 3.11.4 does not properly determine the need for UDP Fragmentation Offload (UFO) processing of small packets after the UFO queueing of a large packet, which allows remote attackers to cause a denial of service (memory corruption and system crash) or possibly have unspecified other impact via network traffic that triggers a large response packet.
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=2811ebac2521ceac84f2bdae402455baa6a7fb47
rhn.redhat.com/errata/RHSA-2013-1490.html
rhn.redhat.com/errata/RHSA-2013-1645.html
rhn.redhat.com/errata/RHSA-2014-0284.html
www.openwall.com/lists/oss-security/2013/09/29/1
www.ubuntu.com/usn/USN-2019-1
www.ubuntu.com/usn/USN-2021-1
www.ubuntu.com/usn/USN-2022-1
www.ubuntu.com/usn/USN-2024-1
www.ubuntu.com/usn/USN-2038-1
www.ubuntu.com/usn/USN-2039-1
www.ubuntu.com/usn/USN-2041-1
www.ubuntu.com/usn/USN-2045-1
www.ubuntu.com/usn/USN-2049-1
www.ubuntu.com/usn/USN-2050-1
bugzilla.redhat.com/show_bug.cgi?id=1011927
github.com/torvalds/linux/commit/2811ebac2521ceac84f2bdae402455baa6a7fb47