The polkit_backend_action_pool_init function in polkitbackend/polkitbackendactionpool.c in PolicyKit (aka polkit) before 0.113 might allow local users to gain privileges via duplicate action IDs in action descriptions.
lists.freedesktop.org/archives/polkit-devel/2015-July/000432.html
lists.opensuse.org/opensuse-security-announce/2015-10/msg00010.html
lists.opensuse.org/opensuse-updates/2015-11/msg00042.html
www.securitytracker.com/id/1035023
bugs.freedesktop.org/show_bug.cgi?id=83590
bugzilla.redhat.com/show_bug.cgi?id=1245673
security.gentoo.org/glsa/201611-07
usn.ubuntu.com/3717-2/