That's not necessarily true, there's been several security layers added these past few years. The YAMA LSM prevents user processes from reading the memory of pr

That's not necessarily true, there's been several security layers added these past few years. The YAMA LSM prevents user processes from reading the memory of processes that are not its children. It's already enabled by default in Ubuntu (but not Fedora, they decided to keep it disabled by default so that user gdb still works). There are definitely still holes in the Linux security model, especially regarding file access (any user process having access to all the user's files is far too broad), but that doesn't mean we should just leave known vulnerabilities open, especially since an attacker may not have all methods of attack available.