Yes you are correct they offer drivers for vanilla 2.6.12 or better kernels from kernel.org and they offer drivers and such for vanilla kernels 2.6.6 or less. The thing you need to know is Fedora / Red Hat kernels are not vanilla kernels, they add backports from the vanilla upstrean kernels and make other tweaks to the kernel. In other words they are not 'one to one' compatible with the vanilla kernel source.
FYI: nothing is stopping you from installing the kernel update yourself, for example as root from the console or xterm session;
rpm -ivh
http://download.fedora.redhat.com/pu...2_FC4.i686.rpm