Same way you would have done it if you had been able to 'wget' it to local storage, just a different path. The commands below I just typed from memory and may need a bit of tweaking to work just right, paths/filenames changed to match, etc.
1. Attach .iso to virtual drive (sounds like you got that done already)
2. Open a terminal with a root shell ('sudo -i' to get a root-interactive shell once you have a terminal open)
3. Mount the CD ('mount /dev/cdrom /mnt' : Your CD device may be called something other than /dev/cdrom. You can use any empty folder as a destination, or make a new one.)
4. Install the RPM from the CD ('yum install /mnt/kmod-.....rpm' : Either use the full name of the RPM, or 'yum install /mnt/*.rpm')
5. If it installed successfully, unmount the CD ('umount /mnt'), disconnect the virtual media, and reboot to see if the new driver works.
If it did not install it is most likely due to yum trying to install dependencies that it can't get with no internet access - you should see that in the yum output. You can work around that issue by grabbing the RPM files for the missing dependencies and putting all of them onto the .iso, then 'yum install /mnt/*.rpm' to install all of it in a single command.
