libndp before 1.6, as used in NetworkManager, does not properly validate the origin of Neighbor Discovery Protocol (NDP) messages, which allows remote attackers to conduct man-in-the-middle attacks or cause a denial of service (network connectivity disruption) by advertising a node as a router from a non-local network.
www.debian.org/security/2016/dsa-3581
www.openwall.com/lists/oss-security/2016/05/17/9
www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
www.ubuntu.com/usn/USN-2980-1
github.com/jpirko/libndp/commit/2af9a55b38b55abbf05fd116ec097d4029115839
github.com/jpirko/libndp/commit/a4892df306e0532487f1634ba6d4c6d4bb381c7f
rhn.redhat.com/errata/RHSA-2016-1086.html