xvfb-run 1.6.1 in Debian GNU/Linux, Ubuntu, Fedora 10, and possibly other operating systems place the magic cookie (MCOOKIE) on the command line, which allows local users to gain privileges by listing the process and its arguments.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Debian_linux | Debian | * | * |
| Fedora | Redhat | 10 (including) | 10 (including) |
| Linux | Ubuntu | * | * |
| Xorg-server | Ubuntu | dapper | * |
| Xorg-server | Ubuntu | hardy | * |
| Xorg-server | Ubuntu | intrepid | * |
| Xorg-server | Ubuntu | jaunty | * |