The latest stable version of the Linux kernel is: 2.4.18 The latest prepatch for the stable Linux kernel tree is: 2.4.19-pre9 +The latest beta version of the Linux kernel is: 2.5.20 The latest prepatch for the beta Linux kernel tree is: 2.5.8-pre3 The latest 2.2 version of the Linux kernel is: 2.2.21 The latest prepatch for the 2.2 Linux kernel tree is: 2.2.21-rc4