It seems all drivers are OK:
[root@icap maro]# find /lib -iname "*acm*"
/lib/modules/2.4.22-1.2149.nptl/kernel/drivers/usb/acm.o
/lib/modules/2.4.22-1.2149.nptlsmp/kernel/drivers/usb/acm.o
[root@icap maro]# find /lib -iname "*cdcether*"
/lib/modules/2.4.22-1.2149.nptl/kernel/drivers/usb/CDCEther.o
/lib/modules/2.4.22-1.2149.nptlsmp/kernel/drivers/usb/CDCEther.o
[root@icap maro]# find /lib -iname "*usbnet*"
/lib/modules/2.4.22-1.2149.nptl/kernel/drivers/usb/usbnet.o
/lib/modules/2.4.22-1.2149.nptlsmp/kernel/drivers/usb/usbnet.o
[root@icap maro]#