No, but it can be assumed that modern OSs make few "trivial mistakes" that can be used for "Privilege Escalation/Buffer Overflow". Thus it is rather probable th

No, but it can be assumed that modern OSs make few "trivial mistakes" that can be used for "Privilege Escalation/Buffer Overflow". Thus it is rather probable that a nontrivial bug was used for this. But since this kind of bugs were not found by the BSD developers until this potential exploit, you better understand the root cause and audit the code for it, since there are good reasons to believe that there could be similar bugs.