You can get the Ubuntu patches in mintUpdate:
- open the preferences.
- make level 5 visible.
- sort the list of updates by level to see the kernel (level 5).
- clear the list to have nothing selected.
- select the kernel (linux-image-...)
- click install updates
- go back to preferences and make level 5 invisible again.
Now, before you do that... make sure you know why you're doing it. If you're a home user, behind a physical router + ISP (NAT and all) and you've been using kernel modules (nvidia drivers, restricted manager for wifi, virtualbox..etc..) you probably:
1- don't care about hackers.
2- do care about the stability of your system.
so in this case, don't bother upgrading. Things work now, will they work as well then?
If you're on standard hardware and exposed on the Internet (a server for instance) then you'll probably want to take the update.
It's up to you basically