Mandrake has released a fix. Red Hat has released a fixed package. Immunix has released a fix. Redhat 7.0, almost definately earlier based on dates in sourcecode comments. May not be a security hole on other distributions.
Root exploit does exist.
If minicom -s hasn't been run as root prior, then this exploit will probably not work. Part of the command is of course the filename. No such file or directory. Ok, big deal. You get gid uucp if you exploit it.