OpenBSD and NetBSD permit usermode code to kill the display server and write to the X.Org /dev/xf86 device, which allows local users with root privileges to reduce securelevel by replacing the System Management Mode (SMM) handler via a write to an SMRAM address within /dev/xf86 (aka the video card memory-mapped I/O range), and then launching the new handler via a System Management Interrupt (SMI), as demonstrated by a write to Programmed I/O port 0xB2.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Netbsd | Netbsd | 2.0.4 (including) | 2.0.4 (including) |
| Openbsd | Openbsd | * | * |