"The current leading edge of RHEL releases is the 6.2 branch.
Red Hat released RHEL 6.2on December 7, providing new cgroups
resource control features.
Just over a week later, Oracle released its RHEL-based Linux
release, Oracle Linux 6.2. Oracle Linux 6.2 differs from the RHEL
6.2 release in a few key areas, most notably the kernel. Oracle
uses its Unbreakable Linux Kernel (kernel-uek) and provides
additional support for the OCFS2 (Oracle Cluster Filesystem).