On a well-maintained Linux system, months can go by without needing to reboot. Sooner or later, however, a security patch to the Linux kernel will require you to reboot your machine. That's not a real problem on a desktop, but when you're talking hundreds of servers it can be a real pain. That's where CloudLinux's new program KernelCare comes in.
There have been a lot of media reports about Linux security problems recently. ZDNet has taken a stand and pointed out that the problem isn't with Linux, the problem is with certain Linux users and administrators. I'd also argue that the problem is also with certain media outlets who jump on the "linux security stinks!" bandwagon at the earliest opportunity.