VULNERABILITY INTELLIGENCE
CVE-2006-6730
CVSS score6.6 MEDIUM
EPSS probability0.26%
CISA KEVNot currently listed
Published2006-12-26
Last modified2026-06-16
CVSS vectorAV:L/AC:M/Au:S/C:C/I:C/A:C
Description
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.