The IPTables firewall in OpenStack Neutron before 7.0.4 and 8.0.0 through 8.1.0 allows remote attackers to bypass an intended MAC-spoofing protection mechanism and consequently cause a denial of service or intercept network traffic via (1) a crafted DHCP discovery message or (2) crafted non-IP traffic.
www.openwall.com/lists/oss-security/2016/06/10/5
www.openwall.com/lists/oss-security/2016/06/10/6
access.redhat.com/errata/RHSA-2016:1473
access.redhat.com/errata/RHSA-2016:1474
bugs.launchpad.net/neutron/+bug/1558658
review.openstack.org/#/c/299021/
review.openstack.org/#/c/299023/
review.openstack.org/#/c/299025/
security.openstack.org/ossa/OSSA-2016-009.html