This news made me realized that there are still advantages for having an outdated phone 
, probably I'll keep using it for the meantime or maybe search for a better brand.
, probably I'll keep using it for the meantime or maybe search for a better brand.I don't think there are any concrete advantages in using an old phone. If your phone isn't getting security updates anymore, you could be vulnerable to both old and new exploits. This particular vulnerability can be patched, for instance.
The thing with phones separate from their kernel issue is you are downloading apps from the app store which could potentially infect your phone as well as usually requiring massive amounts of private/unneeded data from your phone.
It's not necessarily a kernel issue, as nothing is inherently wrong with them; it's an exploit. If you put things that way, PC isn't any more secure, with threats like malvertising requiring zero interaction from end users to infect. Knowing what to do and what not to do will protect you against most threats you're likely to face, regardless of the platform you're using.
). It is of course very logical that all older models are already worked out, and newer ones are waiting in line. There is only a small percentage of new models compared to all models from recent years. It is much more profitable for hackers to work on older devices, because they have a lot more users, and thus potential victims and profits for them.