[root@centos_arm main]# yum list | grep kernel
kernel-headers.armv7hl 4.14.28-201.el7.centos @base
raspberrypi2-firmware.armv7hl 4.14.52-v7.1.el7 @centos-kernel
raspberrypi2-kernel.armv7hl 4.14.27-v7.1.el7 @instKern/$releasever
raspberrypi2-kernel.armv7hl 4.14.52-v7.1.el7 @centos-kernel
raspberrypi2-kernel-devel.armv7hl 4.14.52-v7.1.el7 @centos-kernel
abrt-addon-kerneloops.armv7hl 2.1.11-50.el7.centos base
libreport-plugin-kerneloops.armv7hl 2.1.11-40.el7.centos base
raspberrypi-vc-demo-source.noarch 20170705-502.gitaa39775.el7 centos-kernel
raspberrypi-vc-libs-devel.armv7hl 20170705-502.gitaa39775.el7 centos-kernel
raspberrypi-vc-static.armv7hl 20170705-502.gitaa39775.el7 centos-kernel
texlive-l3kernel.noarch 2:svn29409.SVN_4469-38.el7 base
texlive-l3kernel-doc.noarch 2:svn29409.SVN_4469-38.el7 base
Not quite sure what that "instKern" repo is. Can't find anything on Google about it.