On April 25, 2014, Github initiated the following security patch (https://developer.github.com/changes/2014-04-25-user-content-security/).
Unfortunately, the redirect from github.com to githubusercontent.com was failing during chef provisioning for my team’s vagrant instance.
I forked rvm and updated appropriate instances of github.com to githubusercontent.com to accommodate the Github security patch.
RVM has since been updated to include these updates in version 1.25.25. The issue was closed here.