Can't seem to find a CEBA for the bug fixes for the kernel and ypbind for CentOS-4. Upstream bug reports can be found here:
kernel-2.6.9-101.EL: https://rhn.redhat.com/errata/RHBA-2011-0968.html
ypbind-1.17.2-17.el4_8: http://rhn.redhat.com/errata/RHBA-2011-0955.html
Regards, Leonard.