Originally derived from Red Hat Enterprise Linux (RHEL), Oracle Linux (OL) contains minor differences, such as those necessary to differentiate itself e.g. modified /etc/redhat-release and /etc/issue file content, as well as /etc/enterprise-release, /etc/system-release, /etc/oracle-release files, etc.

Latest Oracle Linux versions additionally provide an alternative, compatible kernel - the Unbreakable Enterprise Kernel (UEK) along side the native Red Hat compatible kernel (RHCK).

Following is a list of RHEL major release/update kernel versions/release string content along with corresponding OL information.

Red Hat Enterprise Linux Version / Update

Red Hat Enterprise Linux - Kernel version / redhat-release string

Oracle Linux - Kernel version / release strings
     

Red Hat Enterprise Linux 7

    
 Red Hat Enterprise Linux 7 Update 6  3.10.0-957.el7.x86_64
 redhat-release: Red Hat Enterprise Linux Server release 7.6 (Maipo)		  4.14.35-1818.3.3.el7uek.x86_64 ^ * (x86_64 only)
 3.10.0-957.el7.x86_64 ^ (x86_64 only)
 redhat-release: Red Hat Enterprise Linux Server release 7.6 (Maipo)
 system-release: Oracle Linux Server release 7.6
 oracle-release: Oracle Linux Server release 7.6
 Red Hat Enterprise Linux 7 Update 5  3.10.0-862.el7.x86_64
 redhat-release: Red Hat Enterprise Linux Server release 7.5 (Maipo)		  4.1.12-112.16.4.el7uek ^ * (x86_64 only)
 3.10.0-862.el7.x86_64 ^ (x86_64 only)
 redhat-release: Red Hat Enterprise Linux Server release 7.5 (Maipo)
 system-release: Oracle Linux Server release 7.5
 oracle-release: Oracle Linux Server release 7.5
 Red Hat Enterprise Linux 7 Update 4  3.10.0-693.el7.x86_64
 redhat-release: Red Hat Enterprise Linux Server release 7.4 (Maipo)		  4.1.12-94.3.9.el7uek ^ * (x86_64 only)
 3.10.0-693.el7.x86_64 ^ (x86_64 only)
 redhat-release: Red Hat Enterprise Linux Server release 7.4 (Maipo)
 system-release: Oracle Linux Server release 7.4
 oracle-release: Oracle Linux Server release 7.4
 Red Hat Enterprise Linux 7 Update 3  3.10.0-514.el7.x86_64
 redhat-release: Red Hat Enterprise Linux Server release 7.3 (Maipo)		  4.1.12-61.1.18.el7uek ^ * (x86_64 only)
 3.10.0-514.el7.x86_64 ^ (x86_64 only)
 redhat-release: Red Hat Enterprise Linux Server release 7.3 (Maipo)
 system-release: Oracle Linux Server release 7.3
 oracle-release: Oracle Linux Server release 7.3
 Red Hat Enterprise Linux 7 Update 2  3.10.0-327.el7.x86_64
 redhat-release: Red Hat Enterprise Linux Server release 7.2 (Maipo)		  3.8.13-98.6.1.el7uek ^ * (x86_64 only)
 3.10.0-327.el7.x86_64 ^ (x86_64 only)
 redhat-release: Red Hat Enterprise Linux Server release 7.2 (Maipo)
 system-release: Oracle Linux Server release 7.2
 oracle-release: Oracle Linux Server release 7.2
 Red Hat Enterprise Linux 7 Update 1  3.10.0-229.el7.x86_64
 redhat-release: Red Hat Enterprise Linux Server release 7.1 (Maipo)		  3.8.13-55.1.6.el7uek ^ * (x86_64 only)
 3.10.0-229.el7.x86_64 ^ (x86_64 only)
 redhat-release:Red Hat Enterprise Linux Server release 7.1 (Maipo)
 system-release:Oracle Linux Server release 7.1
 oracle-release: Oracle Linux Server release 7.1
 Red Hat Enterprise Linux 7 GA  3.10.0-123.el7.x86_64
 redhat-release: Red Hat Enterprise Linux Server release 7.0 (Maipo)		  3.8.13-35.3.1.el7uek ^ * (x86_64 only)
 3.10.0-123.el7.x86_64 ^ (x86_64 only)
 redhat-release:Red Hat Enterprise Linux Server release 7.0 (Maipo)
 system-release:Oracle Linux Server release 7.0
 oracle-release: Oracle Linux Server release 7.0
     

Red Hat Enterprise Linux 6

    
 Red Hat Enterprise Linux Server 6 Update 10
  2.6.32-754.el6
 redhat-release: Red Hat Enterprise Linux Server release 6.10 (Santiago)		  4.1.12-124.16.4.el6uek ^ * (x86_64 only)
 2.6.39-400.299.3.el6uek ^ * (x86 only)
 2.6.32-754.el6 ^ (x86, x86_64)
 redhat-release: Red Hat Enterprise Linux Server release 6.10 (Santiago)
 system-release: Oracle Linux Server release 6.10
 oracle-release: Oracle Linux Server release 6.10
 Red Hat Enterprise Linux Server 6 Update 9
  2.6.32-696.el6
 redhat-release: Red Hat Enterprise Linux Server release 6.9 (Santiago)		  4.1.12-61.1.28.el6uek ^ * (x86_64 only)
 2.6.39-400.294.3.el6uek ^ * (x86 only)
 2.6.32-696.el6 ^ (x86, x86_64)
 redhat-release: Red Hat Enterprise Linux Server release 6.9 (Santiago)
 system-release: Oracle Linux Server release 6.9
 oracle-release: Oracle Linux Server release 6.9
 Red Hat Enterprise Linux Server 6 Update 8  2.6.32-642.el6
 redhat-release: Red Hat Enterprise Linux Server release 6.8 (Santiago)		  4.1.12-37.3.1.el6uek ^ * (x86_64 only)
 2.6.39-400.278.2.el6uek ^ * (x86 only)
 2.6.32-642.el6 ^ (x86, x86_64)
 redhat-release: Red Hat Enterprise Linux Server release 6.8 (Santiago)
 system-release: Oracle Linux Server release 6.8
 oracle-release: Oracle Linux Server release 6.8
 Red Hat Enterprise Linux Server 6 Update 7  2.6.32-573.el6
 redhat-release: Red Hat Enterprise Linux Server release 6.7 (Santiago)		  3.8.13-68.3.4.el6uek ^ * (x86_64 only)
 2.6.39-400.250.7.el6uek ^ * (x86 only)
 2.6.32-573.el6 ^ (x86, x86_64)
 redhat-release: Red Hat Enterprise Linux Server release 6.7 (Santiago)
 system-release: Oracle Linux Server release 6.7
 oracle-release: Oracle Linux Server release 6.7
 Red Hat Enterprise Linux Server 6 Update 6  2.6.32-504.el6
 redhat-release: Red Hat Enterprise Linux Server release 6.6 (Santiago)		  3.8.13-44.1.1.el6uek ^ * (x86_64 only)
 2.6.39-400.215.10.el6uek ^ * (x86 only)
 2.6.32-504.el6 ^ (x86, x86_64)
 redhat-release: Red Hat Enterprise Linux Server release 6.6 (Santiago)
 system-release: Oracle Linux Server release 6.6
 oracle-release: Oracle Linux Server release 6.6
 Red Hat Enterprise Linux Server 6 Update 5  2.6.32-431.el6
 redhat-release: Red Hat Enterprise Linux Server release 6.5 (Santiago)		  3.8.13-16.121.el6uek ^ * (x86_64 only)
 2.6.39-400.211.1.el6uek ^ * (x86 only)
 2.6.32-431.el6 ^ (x86, x86_64)
 redhat-release: Red Hat Enterprise Linux Server release 6.5 (Santiago)
 system-release: Oracle Linux Server release 6.5
 oracle-release: Oracle Linux Server release 6.5

Red Hat Enterprise Linux Server 6 Update 4

  2.6.32-358.el6
 redhat-release: Red Hat Enterprise Linux Server release 6.4 (Santiago)

2.6.39-400.17.1.el6uek ^ *
 2.6.32-358.el6 ^
 redhat-release: Red Hat Enterprise Linux Server release 6.4 (Santiago)
 system-release: Oracle Linux Server release 6.4
 oracle-release: Oracle Linux Server release 6.4
 Red Hat Enterprise Linux Server 6 Update 3  2.6.32-279.el6
 redhat-release: Red Hat Enterprise Linux Server release 6.3 (Santiago)		  2.6.39-200.24.1.el6uek ^ *
 2.6.32-279.el6 ^
 redhat-release: Red Hat Enterprise Linux Server release 6.3 (Santiago)
 system-release: Oracle Linux Server release 6.3
 oracle-release: Oracle Linux Server release 6.3
 Red Hat Enterprise Linux Server 6 Update 2  2.6.32-220.el6
 redhat-release: Red Hat Enterprise Linux Server release 6.2 (Santiago)		  2.6.32-100.34.1.el6uek ^ *
 2.6.32-220.el6 ^
 redhat-release: Red Hat Enterprise Linux Server release 6.2 (Santiago)
 system-release: Oracle Linux Server release 6.2
 oracle-release: Oracle Linux Server release 6.2

Red Hat Enterprise Linux Server 6 Update 1

  2.6.32-131.el6
 redhat-release: Red Hat Enterprise Linux Server release 6.1 (Santiago)		  2.6.32-100.34.1.el6uek ^ *
 2.6.32-131.0.15.el6 ^
 redhat-release: Red Hat Enterprise Linux Server release 6.1 (Santiago)
 system-release: Oracle Linux Server release 6.1
 oracle-release: Oracle Linux Server release 6.1
 Red Hat Enterprise Linux Server 6 GA  2.6.32-71.el6
 redhat-release: Red Hat Enterprise Linux Server release 6.0 (Santiago)		  2.6.32-100.28.5.el6uek ^ *
 2.6.32-71.el6 ^
 redhat-release: Red Hat Enterprise Linux Server release 6.0 (Santiago)
 system-release: Oracle Linux Server release 6.0
 oracle-release: Oracle Linux Server release 6.0
     

Red Hat Enterprise Linux 5

  
 Red Hat Enterprise Linux Server 5 Update 11

 2.6.18-398.el5
 redhat-release: Red Hat Enterprise Linux Server release 5.11 (Tikanga)

  2.6.39-400.215.10.el5uek ^ * (x86, x86_64)
 2.6.18-398.el5 ^ (x86, x86_64)
 2.6.18-398.0.0.0.1.el5 (x86, x86_64)
 redhat-release: Red Hat Enterprise Linux Server release 5.11 (Tikanga)
 enterprise-release: Enterprise Linux Enterprise Linux Server release 5.11 (Carthage)
 oracle-release: Oracle Linux Server release 5.11  
 Red Hat Enterprise Linux Server 5 Update 10

 2.6.18-371.el5
 redhat-release: Red Hat Enterprise Linux Server release 5.10 (Tikanga)

  2.6.39-400.209.1.el5uek ^ * (x86, x86_64)
 2.6.18-371.el5 ^ (x86, x86_64)
 2.6.18-371.0.0.0.1.el5 (x86, x86_64)
 redhat-release: Red Hat Enterprise Linux Server release 5.10 (Tikanga)
 enterprise-release: Enterprise Linux Enterprise Linux Server release 5.10 (Carthage)
 oracle-release: Oracle Linux Server release 5.10
 Red Hat Enterprise Linux Server 5 Update 9  2.6.18-348.el5
 redhat-release: Red Hat Enterprise Linux Server release 5.9 (Tikanga)		  2.6.39-300.26.1.el5uek ^ * (x86, x86_64)
 2.6.18-348.el5 ^ (x86, x86_64)
 2.6.18-348.0.0.0.1.el5 (x86, x86_64)
 redhat-release: Red Hat Enterprise Linux Server release 5.9 (Tikanga)
 enterprise-release: Enterprise Linux Enterprise Linux Server release 5.9 (Carthage)
 oracle-release: Oracle Linux Server release 5.9
 Red Hat Enterprise Linux Server 5 Update 8  2.6.18-308.el5
 redhat-release: Red Hat Enterprise Linux Server release 5.8 (Tikanga)		  2.6.32-300.10.1.el5uek ^ * (x86, x86_64)
 2.6.18-308.el5 ^ (x86, x86_64)
 2.6.18-308.0.0.0.1.el5 (x86, x86_64)
 redhat-release: Red Hat Enterprise Linux Server release 5.8 (Tikanga)
 enterprise-release: Enterprise Linux Enterprise Linux Server release 5.8 (Carthage)
 oracle-release: Oracle Linux Server release 5.8
 Red Hat Enterprise Linux Server 5 Update 7  2.6.18-274.el5
 redhat-release: Red Hat Enterprise Linux Server release 5.7 (Tikanga)		  2.6.32-200.13.1.el5uek ^ * (x86, x86_64)
 2.6.18-274.el5 ^ (x86, x86_64)
 2.6.18-274.0.0.0.1.el5 (x86, x86_64)
 redhat-release: Red Hat Enterprise Linux Server release 5.7 (Tikanga)
 enterprise-release: Enterprise Linux Enterprise Linux Server release 5.7 (Carthage)
 oracle-release: Oracle Linux Server release 5.7
 Red Hat Enterprise Linux Server 5 Update 6  2.6.18-238.el5
 redhat-release: Red Hat Enterprise Linux Server release 5.6 (Tikanga)		  2.6.32-100.26.2.el5uek ^ * (x86_64 only)
 2.6.18-238.el5 ^ (x86, x86_64)
 2.6.18-238.0.0.0.1.el5 (x86, x86_64)
 redhat-release: Red Hat Enterprise Linux Server release 5.6 (Tikanga)
 enterprise-release: Enterprise Linux Enterprise Linux Server release 5.6 (Carthage)
 oracle-release: Oracle Linux Server release 5.6
 Red Hat Enterprise Linux Server 5 Update 5  2.6.18-194.el5
 redhat-release: Red Hat Enterprise Linux Server release 5.5 (Tikanga)		  2.6.18-194.el5 ^ * (x86, x86_64, ia64)
 2.6.32-100.24.1.el5 # (x86_64 only)
 2.6.18-194.0.0.0.3.el5 (x86, x86_64, ia64)
 redhat-release: Red Hat Enterprise Linux Server release 5.5 (Tikanga)
 enterprise-release: Enterprise Linux Enterprise Linux Server release 5.5 (Carthage)
 oracle-release: Oracle Linux Server release 5.5
 Red Hat Enterprise Linux Server 5 Update 4  2.6.18-164.el5
 redhat-release: Red Hat Enterprise Linux Server release 5.4 (Tikanga)		  2.6.18-164.el5 ^ * (x86, x86_64, ia64)
 2.6.18-164.0.0.0.1.el5 (x86, x86_64, ia64)
 UEK unavailable
 redhat-release: Red Hat Enterprise Linux Server release 5.4 (Tikanga)
 enterprise-release: Enterprise Linux Enterprise Linux Server release 5.4 (Carthage)
 Red Hat Enterprise Linux Server 5 Update 3  2.6.18-128.el5
 redhat-release: Red Hat Enterprise Linux Server release 5.3 (Tikanga)		  2.6.18-128.el5 ^ * (x86, x86_64, ia64)
 2.6.18-128.0.0.0.2.el5 (x86, x86_64, ia64)
 UEK unavailable
 redhat-release: Red Hat Enterprise Linux Server release 5.3 (Tikanga)
 enterprise-release: Enterprise Linux Enterprise Linux Server release 5.3 (Carthage)
 Red Hat Enterprise Linux Server 5 Update 2  2.6.18-92.el5
 redhat-release: Red Hat Enterprise Linux Server release 5.2 (Tikanga)		  2.6.18-92.el5 ^ * (x86, x86_64, ia64)
 2.6.18-92.0.0.0.1.el5 (x86, x86_64, ia64)
 UEK unavailable
 redhat-release: Enterprise Linux Enterprise Linux Server release 5.2 (Carthage)
 enterprise-release: Enterprise Linux Enterprise Linux Server release 5.2 (Carthage)
 Red Hat Enterprise Linux Server 5 Update 1  2.6.18-53.el5
 redhat-release: Red Hat Enterprise Linux Server release 5.1 (Tikanga)		  2.6.18-53.el5 ^ * (x86, x86_64, ia64)
 2.6.18-53.0.0.0.1.el5 (x86, x86_64, ia64)
 UEK unavailable
 redhat-release: Enterprise Linux Enterprise Linux Server release 5.1 (Carthage)
 enterprise-release: Enterprise Linux Enterprise Linux Server release 5.1 (Carthage)
 Red Hat Enterprise Linux Server 5 GA  2.6.18-8.el5
 redhat-release: Red Hat Enterprise Linux Server release 5 (Tikanga)		  2.6.18-8.el5 ^ * (x86, x86_64, ia64)
 2.6.18-8.0.0.4.1.el5 (x86, x86_64, ia64)
 UEK unavailable
 redhat-release: Enterprise Linux Enterprise Linux Server release 5 (Carthage)
 enterprise-release: Enterprise Linux Enterprise Linux Server release 5 (Carthage)
     

Red Hat Enterprise Linux 4

    
 Red Hat Enterprise Linux 4 Update 9  2.6.9-100.EL
 redhat-release: Red Hat Enterprise Linux AS release 4 (Nahant Update 9)		  2.6.9-100.0.0.0.1.EL ^ * (x86, x86_64, ia64)
 2.6.9-100.EL (x86, x86_64, ia64)
 UEK unavailable
 redhat-release: Red Hat Enterprise Linux AS release 4 (Nahant Update 9)
 enterprise-release: Enterprise Linux Enterprise Linux AS release 4 (October Update 9)

Red Hat Enterprise Linux 4 Update 8

  2.6.9-89.EL
 redhat-release: Red Hat Enterprise Linux AS release 4 (Nahant Update 8)		  2.6.9-89.0.0.0.1.EL ^ * (x86, x86_64, ia64)
 2.6.9-89.EL (x86, x86_64, ia64)
 UEK unavailable
 redhat-release: Red Hat Enterprise Linux AS release 4 (Nahant Update 8)
 enterprise-release: Enterprise Linux Enterprise Linux AS release 4 (October Update 8)
 Red Hat Enterprise Linux 4 Update 7  2.6.9-78.EL
 redhat-release: Red Hat Enterprise Linux AS release 4 (Nahant Update 7)		  2.6.9-78.0.0.0.1.EL ^ * (x86, x86_64, ia64)
 2.6.9-78.EL (x86, x86_64, ia64)
 UEK unavailable
 redhat-release: Enterprise Linux Enterprise Linux AS release 4 (October Update 7)
 enterprise-release: Enterprise Linux Enterprise Linux AS release 4 (October Update 7)
 Red Hat Enterprise Linux 4 Update 6  2.6.9-67.EL
 redhat-release: Red Hat Enterprise Linux AS release 4 (Nahant Update 6)		  2.6.9-67.0.0.0.1.EL ^ * (x86, x86_64, ia64)
 2.6.9-67.EL ^ * (x86, x86_64, ia64)
 UEK unavailable
 redhat-release: Enterprise Linux Enterprise Linux AS release 4 (October Update 6)
 enterprise-release: Enterprise Linux Enterprise Linux AS release 4 (October Update 6)
 Red Hat Enterprise Linux 4 Update 5  2.6.9-55.EL
 redhat-release: Red Hat Enterprise Linux AS release 4 (Nahant Update 5)		  2.6.9-55.0.0.0.2.EL ^ * (x86, x86_64)
 2.6.9-55.EL (x86, x86_64)
 UEK unavailable
 redhat-release: Enterprise Linux Enterprise Linux AS release 4 (October Update 5)
 enterprise-release: Enterprise Linux Enterprise Linux AS release 4 (October Update 5)
 Red Hat Enterprise Linux 4 Update 4  2.6.9-42.EL
 redhat-release: Red Hat Enterprise Linux AS release 4 (Nahant Update 4		  2.6.9-42.0.0.0.1.EL ^ * (x86, x86_64)
 2.6.9-42.EL (x86, x86_64)
 UEK unavailable
 redhat-release: Enterprise Linux Enterprise Linux AS release 4 (October Update 4)
 enterprise-release: Enterprise Linux Enterprise Linux AS release 4 (October Update 4)
 Red Hat Enterprise Linux 4 Update 3  2.6.9-34.EL
 redhat-release: Red Hat Enterprise Linux AS release 4 (Nahant Update 3)		 No corresponding version
 Red Hat Enterprise Linux 4 Update 2  2.6.9-22.EL
 redhat-release: Red Hat Enterprise Linux AS release 4 (Nahant Update 2)		 No corresponding version
 Red Hat Enterprise Linux 4 Update 1  2.6.9-11.EL
 redhat-release: Red Hat Enterprise Linux AS release 4 (Nahant Update 1)		 No corresponding version

Red Hat Enterprise Linux 4 GA

2.6.9-5.EL
 redhat-release: Red Hat Enterprise Linux AS release 4 (Nahant)

No corresponding version
     

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