The Implementation Guide shows support for the following distros:
Red Hat Enterprise Linux 5.7, kernel 2.6.18-274.18.1.el5
Red Hat Enterprise Linux 5.8, kernel 2.6.18-308.4.1.el5
Red Hat Enterprise Linux 6.2, kernel 2.6.32-220.13.1.el6
Red Hat Enterprise Linux 6.3, kernel 2.6.32-279.el6