Researchers at the Qualys Threat Research Unit (TRU) have unearthed discovered a critical security flaw in OpenSSH's server (sshd) in glibc-based Linux systems.
They probably can. jut every hack done has the possibility of spoiling the exploit. A good exploit can cost a million $. So if hacking you is worth more then say 100k to them, you're in trouble. Otherwise they will only target you with everyday surveilance.
That's a spooky one. From first glance - 500 employees and zero click takeovers of phones? Yikes. Makes me want to not have a phone... Ofc Google/Apple/USA have had this capacity for ages
Yes, targeted attacks like that definitely exist, most famously maybe the most recent social pressure to merge a vulnerability to the xz library by actor "Jia Tan":
This started a whole discussion about relying on (often unpaid) volunteer work for critical systems and the pressure and negativity these people face, which is a discussion that was absolutely needed, and which we are still lightyears away from fixing.
(I can only recommend reading the whole story around this issue, which boils down to Microsoft admitting they rely on an open source project for something they consider critical to their customers, but not willing to pay the maintainer a bounty for fixing the issue)