Possible security bug with unmount

[Vincent Povirk]

It's a potential issue in a situation when you have multiple users on
one machine that are allowed to mount discs or disc images without
root access, or if you have a CD with a malicious label that gets
copied into the mount point (though maybe automounters will escape the
label).

I don't know that this can be turned into a real attack on its own,
but lack of imagination is not a good argument for something not being
a security risk.