The br_mdb_ip_get function in net/bridge/br_multicast.c in the Linux kernel before 2.6.35-rc5 allows remote attackers to cause a denial of service (NULL pointer dereference and system crash) via an IGMP packet, related to lack of a multicast table.
http://www.spinics.net/lists/netdev/msg134444.html
http://www.securityfocus.com/bid/41432
http://openwall.com/lists/oss-security/2011/02/16/8
http://openwall.com/lists/oss-security/2011/02/16/14