Yes, the SCC nodes are running an older Linux kernel. And libc-2.3.6 is the standard C library included with that kernel.
Please feel free to experiment with newer ibraries. You can install and use icc/gcc under your own /home as well as under /opt. Each icc data center user has his/her own icc license, so a personalized copy should still work for you. If it does not, it's a bug.