The get_option function in dhcpcd 4.0.0 through 6.x before 6.4.3 allows remote DHCP servers to cause a denial of service by resetting the DHO_OPTIONSOVERLOADED option in the (1) bootfile or (2) servername section, which triggers the option to be processed again.
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2014&m=slackware-security.462420
http://www.securityfocus.com/bid/68970
http://www.openwall.com/lists/oss-security/2014/09/01/11
http://www.openwall.com/lists/oss-security/2014/07/30/5
http://www.mandriva.com/security/advisories?name=MDVSA-2014:171
http://source.android.com/security/bulletin/2016-04-02.html
http://roy.marples.name/projects/dhcpcd/ci/1d2b93aa5ce25a8a710082fe2d36a6bf7f5794d5?sbs=0