dhcpcd before 6.10.0, as used in Android 4.x before 4.4.4, 5.0.x before 5.0.2, 5.1.x before 5.1.1, and 6.x before 2016-04-01 and other products, mismanages option lengths, which allows remote attackers to execute arbitrary code or cause a denial of service (heap-based buffer overflow) via a malformed DHCP response, aka internal bug 26461634.
https://security.gentoo.org/glsa/201606-07
https://h20566.www2.hp.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05388711
https://android.googlesource.com/platform/external/dhcpcd/+/1390ace71179f04a09c300ee8d0300aa69d9db09
http://www.securitytracker.com/id/1034601
http://source.android.com/security/bulletin/2016-04-02.html
http://roy.marples.name/projects/dhcpcd/info/76a1609352263bd9def1300d7ba990679571fa30