Samba can be made to start multiple incompatible RPC listeners, disrupting service on the AD DC. When Samba's RPC server is under load, or otherwise not responding, the servers NOT built for the AD DC (eg build instead for the NT4-emulation "classic DCs") can be incorrectly started, and compete to listen on the same unix domain sockets. This then results in some queries being answered by the AD DC, and some not. "The procedure number is out of range" when starting Active Directory Users and Computers tool, however it can also be triggered maliciously, to prevent service on the AD DC.
This CVE is now Public:
Created samba tracking bugs for this issue:
Affects: fedora-all [bug 2243232]