The get_rx_bufs function in drivers/vhost/net.c in the vhost-net subsystem in the Linux kernel package before 2.6.32-431.11.2 on Red Hat Enterprise Linux (RHEL) 6 does not properly handle vhost_get_vq_desc errors, which allows guest OS users to cause a denial of service (host OS crash) via unspecified vectors.
https://bugzilla.redhat.com/show_bug.cgi?id=1062577
http://www.securityfocus.com/bid/66441
http://secunia.com/advisories/59386