Security updates only for Fedora 7 / RHEL & Centos 5
I found this on redhat.com the other day….
It is now possible to limit yum to install security updates only. To do so, simply install the yum-security plugin and run the following command:
yum update –security
Hopefully this will allow fedora users to have the option of running a “stable” install 
It’s actually
yum update –-security
and not
yum update –security