dhcpcd before 6.10.0 allows remote attackers to cause a denial of service (invalid read and crash) via vectors related to the option length.
https://security.gentoo.org/glsa/201606-07
http://www.securitytracker.com/id/1034601
http://www.openwall.com/lists/oss-security/2016/01/07/4
http://www.openwall.com/lists/oss-security/2016/01/07/3
http://roy.marples.name/projects/dhcpcd/timeline?r=trunk&nd&c=2016-01-07+16%3A47%3A19&n=200
http://roy.marples.name/projects/dhcpcd/info/595883e2a431f65d8fabf33059aa4689cca17403