RedHat (and thus CentOS) use their own naming conventions. The current RedHat/Centos4 kernel is 2.6.9-67.0.4.ELsmp which means it was originally based on a 2.6.9 kernel, but they've backported a lot of fixes from later versions. (This version numbering issue is the biggest problem with RedHat based systems; we can't actually tell what kernel features are present!)
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