After you have installed the RHEL OS, you have the option of installing and using the Oracle Linux Support kernel (formerly known as the Oracle Unbreakable Enterprise Kernel for Linux). See Oracle Linux Support Kernel.
# cd /etc/yum.repos.d # wget http://public-yum.oracle.com/public-yum-el6.repo
[public_ol6_u5_base] name=Oracle Linux $releasever Update 5 installation media copy ($basearch) baseurl=http://public-yum.oracle.com/repo/OracleLinux/OL6/5/base/$basearch/ gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle gpgcheck=1 enable=1
# yum install kernel
# yum install oracle-linux