CVE-2006-6730

MediumCVSS 6.6/10Last modified Jun 16, 2026

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.

Metrics

CVSS 2.0 6.6/10AV:L/AC:M/Au:S/C:C/I:C/A:C

Affected software

No affected versions have been published.

Timeline

Published: Dec 26, 2006
Last modified: Jun 16, 2026
NVD status: Modified

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