Upgrading the Linux Kernel

You could upgrade the kernel via elrepo.

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm (external link)
yum install --enablerepo=elrepo-kernel kernel-ml

You can also install the updated firmware and headers

yum install --enablerepo=elrepo-kernel kernel-ml-{firmware,headers,devel}

You'll probably need to remove the kernel-firmware first:

yum remove kernel-{firmware,headers,devel}