If yum is working for you, try a sudo yum install yumex, and then run yumex and select the update tab. That will show you what's available and let you select the updates you want to install. It's much easier to use than up2date, although it doesn't normally run "automatically." It does, however, show you all the available updates, not just the "critical" ones.
By the way, the sudo prefix in the command above will only work if you've added yourself to the sudoers file. See info sudoers for details.
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