# uname -r

To enable the ELRepo repository on CentOS 7

# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
# rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm

To list the available kernel.related packages:

# yum --disablerepo="*" --enablerepo="elrepo-kernel" list available

Install the latest mainline stable kernel

# yum --enablerepo=elrepo-kernel install kernel-ml
# reboot
# uname -sr