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.
https://access.redhat.com/errata/RHSA-2019:2046
https://access.redhat.com/errata/RHSA-2019:3232
https://bugs.debian.org/915332
https://gitlab.freedesktop.org/polkit/polkit/issues/74
https://lists.debian.org/debian-lts-announce/2019/01/msg00021.html
https://security.gentoo.org/glsa/201908-14
https://usn.ubuntu.com/3861-1/