From http://www.redhat.com/security/archives.html

Red Hat Enterprise Linux 3   = Taroon
           Red Hat Linux 9   = Shrike
           Red Hat Linux 8   = Psyche
           Red Hat Linux 7.3 = Valhalla
           Red Hat Linux 7.2 = Enigma
           Red Hat Linux 7.1 = Seawolf
           Red Hat Linux 7   = Guinness
           Red Hat Linux 6.2 = Zoot
           Red Hat Linux 6.1 = Cartman
           Red Hat Linux 6   = Hedwig
           Red Hat Linux 5.2 = Apollo
           Red Hat Linux 5.1 = Manhattan
           Red Hat Linux 5   = Hurricane
           Red Hat Linux 4.2 = Biltmore
           Red Hat Linux 4.1 = Vanderbilt
           Red Hat Linux 4   = Colgate