https://www.theregister.co.uk/2018/07/24/oracle_repatch_old_solaris_bug/

A vulnerability first detected and "resolved" years ago in Oracle's Unix OS, Solaris, has resurfaced, necessitating a fix in Big Red's latest quarterly patch batch.

Rather than a Lazarus-like return from the dead, it's more a case of security researchers discovering that the original fix, for a component that's become known as Solaris Availability Suite Service, isn't good enough.