Race condition in the cm_work_handler function in the InfiniBand driver (drivers/infiniband/core/cma.c) in Linux kernel 2.6.x allows remote attackers to cause a denial of service (panic) by sending an InfiniBand request while other request handlers are still running, which triggers an invalid pointer dereference.
http://rhn.redhat.com/errata/RHSA-2011-0927.html
http://secunia.com/advisories/43693
http://www.openwall.com/lists/oss-security/2011/03/11/1
http://www.securityfocus.com/bid/46839
http://www.spinics.net/lists/linux-rdma/msg07447.html
http://www.spinics.net/lists/linux-rdma/msg07448.html