there have been a number of known unpatched issues with consumer grade linix based os platforms the worse offender being ios. as far back as next a vulnerability was found and if they fixed it it was less then 3 years ago.
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.