You're confused -- iOS has nothing whatsoever to do with Linux. It is based on Apple's OS X (now macOS), which was in turn based on NeXTSTEP. Linux is an entirely different OS.
> as far back as next a vulnerability was found and if they fixed it it was less then 3 years ago.
Perhaps you could read up on Windows SMBv1, and its role in the recent WannaCry malware.
In any case, those have nothing to do with Linux.
actually your wrong Job’s nextos was a flavor of linix. the difference between android and ios is how much access the user has to the kernel and how apps can be loaded. My experience actually predated linix with ATTunix a flavor of unix.