Note in the packages page about the kernel.

Ag. Hatzimanikas a.hatzim at
Tue Oct 24 12:17:30 PDT 2006

The following note is absolute. 
The Linux kernel is updated relatively often, many times due to
discoveries of security vulnerabilities. The latest available 2.6.17.x
kernel version should be used, unless the errata page says otherwise. Do
not use version 2.6.18 or later kernels due to potential
incompatibilites with the bootscripts.

More information about the lfs-dev mailing list