Currently, LIDS supports the 2.2 kernel as well as the 2.4 kernel. LIDS development is done using the 2.5 kernel. So, new features will be implemented there first. However, some features may make it back into the 2.2 or 2.4 kernel depending on users' needs. Any security fixes will be backported to the 2.2 or 2.4 kernels. There's also a version of LIDS which is integrated in LSM (Linux Security Modules).