The ip_frag_reasm function in net/ipv4/ip_fragment.c in the Linux kernel 2.6.32-rc8, and 2.6.29 and later versions before 2.6.32, calls IP_INC_STATS_BH with an incorrect argument, which allows remote attackers to cause a denial of service (NULL pointer dereference and hang) via long IP packets, possibly related to the ip_defrag function.
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00496.html
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00453.html
https://bugzilla.redhat.com/show_bug.cgi?id=544144
http://www.ubuntu.com/usn/USN-869-1
http://www.theregister.co.uk/2009/12/11/linux_kernel_bugs_patched/
http://www.securityfocus.com/archive/1/508517/100/0/threaded
http://www.mandriva.com/security/advisories?name=MDVSA-2009:329
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.32
http://wiki.rpath.com/Advisories:rPSA-2009-0161
http://twitter.com/spendergrsec/statuses/6339560349
http://secunia.com/advisories/38017
http://secunia.com/advisories/37624
http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00000.html