A flaw was found in polkit before version 0.116. The implementation of the polkit_backend_interactive_authority_check_authorization function in polkitd allows to test for authentication and trigger authentication of unrelated processes owned by other users. This may result in a local DoS and information disclosure.
https://usn.ubuntu.com/3717-2/
https://security.gentoo.org/glsa/201908-14
https://lists.debian.org/debian-lts-announce/2018/07/msg00042.html