If you're still using the Linux 2.6.20 kernel, the sixteenth iteration has been released with three security fixes. The three fixes in the Linux 2.6.20.17 kernel are for the stack-based buffer overflow in the random number generator, sending arbitrary signals to a child process that is running at higher privileges, and a security problem in the drm/i915 component. The Linux 2.6.20.17 kernel announcement can be read on
Google Groups.