A flaw was found in PolicyKit (aka polkit) 0.115 that allows a user with a uid greater than INT_MAX to successfully execute any systemctl command.
access.redhat.com/errata/RHSA-2019:2046
access.redhat.com/errata/RHSA-2019:3232
bugs.debian.org/915332
gitlab.freedesktop.org/polkit/polkit/issues/74
lists.debian.org/debian-lts-announce/2019/01/msg00021.html
security.gentoo.org/glsa/201908-14
usn.ubuntu.com/3861-1/
usn.ubuntu.com/3861-2/
www.debian.org/security/2018/dsa-4350