The socket implementation in net/core/sock.c in the Linux kernel before 2.6.34 does not properly manage a backlog of received packets, which allows remote attackers to cause a denial of service (memory consumption) by sending a large amount of network traffic, as demonstrated by netperf UDP tests.
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=8eae939f1400326b06d0c9afe53d2a484a326871
kerneltrap.org/mailarchive/linux-netdev/2010/3/3/6271093/thread
secunia.com/advisories/46397
www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.34
www.securityfocus.com/archive/1/520102/100/0/threaded
www.securityfocus.com/bid/46637
www.vmware.com/security/advisories/VMSA-2011-0012.html
bugzilla.redhat.com/show_bug.cgi?id=657303