- Red Hat Enterprise Linux 2.1 AS (Pensacola), 2002-03-26. Uses Linux 2.4.9-e.3
Update 1, 2003-02-14 (kernel 2.4.9-e.12)
Update 2, 2003-05-29 (kernel 2.4.9-e.24)
Update 3, 2003-12-19 (kernel 2.4.9-e.34)
Update 4, 2004-04-21 (kernel 2.4.9-e.40)
Update 5, 2004-08-18 (kernel 2.4.9-e.49)
Update 6, 2004-12-13 (kernel 2.4.9-e.57)
Update 7, 2005-04-28

- Red Hat Enterprise Linux 2.1 ES (Panama), May 2003

• RHEL3
  

- Red Hat Enterprise Linux 3 (Taroon), 2003-10-22. Uses Linux 2.4.21-4
Update 1, 2004-01-16 (kernel 2.4.21-9)
Update 2, 2004-05-12 (kernel 2.4.21-15)
Update 3, 2004-09-03 (kernel 2.4.21-20)
Update 4, 2004-12-12 (kernel 2.4.21-27)
Update 5, 2005-05-18 (kernel 2.4.21-32)
Update 6, 2005-09-28 (kernel 2.4.21-37)
Update 7, 2006-03-17 (kernel 2.4.21-40)
Update 8, 2006-07-20 (kernel 2.4.21-47)
Update 9, 2007-06-15 (kernel 2.4.21-50)

• RHEL4
  

- Red Hat Enterprise Linux 4 (Nahant), 2005-02-15. Uses Linux kernel 2.6.9-5
4.1, also termed Update 1, 2005-06-08 (kernel 2.6.9-11)
4.2, also termed Update 2, 2005-10-05 (kernel 2.6.9-22)
4.3, also termed Update 3, 2006-03-12 (kernel 2.6.9-34)
4.4, also termed Update 4, 2006-08-10 (kernel 2.6.9-42)
4.5, also termed Update 5, 2007-05-01 (kernel 2.6.9-55)
4.6, also termed Update 6, 2007-11-15 (kernel 2.6.9-67)
4.7, also termed Update 7, 2008-07-29 (kernel 2.6.9-78)
4.8, also termed Update 8, 2009-05-19 (kernel 2.6.9-89)
4.9, also termed Update 9, 2011-02-16 (kernel 2.6.9-100)

• RHEL5
  

- Red Hat Enterprise Linux 5 (Tikanga), 2007-03-14. Uses Linux kernel 2.6.18-8
5.1, also termed Update 1, 2007-11-07 (kernel 2.6.18-53)
5.2, also termed Update 2, 2008-05-21 (kernel 2.6.18-92)
5.3, also termed Update 3, 2009-01-20 (kernel 2.6.18-128)
5.4, also termed Update 4, 2009-09-02 (kernel 2.6.18-164)
5.5, also termed Update 5, 2010-03-30 (kernel 2.6.18-194)
5.6, also termed Update 6, 2011-01-13 (kernel 2.6.18-238)
5.7, also termed Update 7, 2011-07-21 (kernel 2.6.18-274)
5.8, also termed Update 8, 2012-02-20 (kernel 2.6.18-308)
5.9, also termed Update 9, 2013-01-07 (kernel 2.6.18-348)
5.10, also termed Update 10, 2013-10-01 (kernel 2.6.18-371)
5.11, also termed Update 11, 2014-09-16 (kernel 2.6.18-398)

• RHEL6
  

- Red Hat Enterprise Linux 6 (Santiago), 2010-11-10 Uses Linux kernel 2.6.32-71
6.1, also termed Update 1, 2011-05-19 (kernel 2.6.32-131)
6.2, also termed Update 2, 2011-12-06 (kernel 2.6.32-220)
6.3, also termed Update 3, 2012-06-20 (kernel 2.6.32-279)
6.4, also termed Update 4, 2013-02-21 (kernel 2.6.32-358)
6.5, also termed Update 5, 2013-11-21 (kernel 2.6.32-431)
6.6, also termed Update 6, 2014-10-13 (kernel 2.6.32-504)

• RHEL7
  

- Red Hat Enterprise Linux 7.0 (Maipo), 10 June 2014 Uses Linux kernel 3.10.0-123