{"cve":"CVE-2006-6730","nvd":{"published":"2006-12-26T23:28:00.000","modified":"2026-06-16T22:33:40.807","status":"Modified","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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["http://lists.freedesktop.org/archives/xorg/2004-June/000927.html","http://www.cansecwest.com/slides06/csw06-duflot.ppt","http://www.securityfocus.com/archive/1/454379/100/0/threaded","http://www.securityfocus.com/archive/1/454510/100/0/threaded","http://www.securityfocus.com/archive/1/454706/100/0/threaded"],"products":["netbsd:netbsd","openbsd:openbsd"],"source":"nvd","synced_at":"2026-10-19T19:43:14.363260067+00:00"},"epss":{"cve":"CVE-2006-6730","score":0.00259,"percentile":0.17608,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}