Kernel release status
The current -mm tree is 2.6.21-rc7-mm2. There's not been a lot of new features going into -mm recently; the focus has been on bug fixes.
The current stable 2.6 kernel is 2.6.21, released on April 25. For those just tuning in, 2.6.21 includes clockevents and the dynamic tick patch, the VMI virtualization interface, a number of KVM improvements, the ALSA system on chip layer, and much more. See the KernelNewbies 2.6.21 summary for vast amounts of detail.
The 2.6.21.1 update added a couple of fixes for security issues in the networking code.
For older kernels: the current 2.6.20 release is 2.6.20.8
2.6.20.9
2.6.20.10
2.6.20.11, released on
May 1. The 2.6.20.11 release contains a few dozen important fixes;
the previous updates contained fixes for networking-related security
problems.
2.6.16.50-rc1 was released on
May 1 with several fixes, a couple of which have CVE numbers attached.
