RHEL kernels are like that. They backport a ton of stuff and the major version number is of little relevance, but it doesn't change because they maintain a stab

RHEL kernels are like that. They backport a ton of stuff and the major version number is of little relevance, but it doesn't change because they maintain a stable kABI. By now the CentOS 7 kernel is probably closer to mainline 4.x and 5.x than the original 3.10