Home routers usually, if they run a Linux-based software stack, use something along the lines of udhcpd, which is part of Busybox, not ISC dhcpd.
It is a serious dilemma however, and affects any system running the vulnerable versions of ISC dhcpd, whether they be *BSD, Solaris, Mac OS X or Linux. Thankfully, one that has been detected, and can be easily patched.
It's a worse problem for DHCP servers that are likely to face untrusted computers; home routers are likely only going to see people who the owners have permitted to access the network, or people who have brute-forced their way in over wifi. The latter bit is the only major concern to router makers.