Scientific Linux Security Update : xen/libvirt on SL5.0 i386/x86_64

NOTE1: The xen update needs to be applied with the new kernel kernel-2.6.18-53.1.4.el5. Because a kernel does not automatically get updated, but the xen libraries do by default it is best to upgrade them both at the same time, and then reboot into the new kernel. Updating both the kernel and xen ...