sendmsg function in NetBSD 1.3 through 1.5 allows local users to cause a denial of service (kernel trap or panic) via a msghdr structure with a large msg_controllen length.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6908
http://www.securityfocus.com/bid/3088
http://archives.neohapsis.com/archives/netbsd/2001-q3/0102.html