CVE-2006-4178

FreeBSD < 5.5 - Denial of Service via i386_set_ldt Integer Signedness Error

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2006-4178. PoCs published by Adriano Lima.

AI-analyzed exploit summary This exploit triggers a local denial-of-service vulnerability in FreeBSD by passing invalid arguments to the i386_set_ldt function, causing the system to crash. The code leverages an input-validation flaw in the handling of integers.

Description

Integer signedness error in the i386_set_ldt call in FreeBSD 5.5, and possibly earlier versions down to 5.2, allows local users to cause a denial of service (crash) via unspecified arguments that use negative signed integers to cause the bzero function to be called with a large length parameter, a different vulnerability than CVE-2006-4172.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Adriano Lima · cdosfreebsd
https://www.exploit-db.com/exploits/28648

This exploit triggers a local denial-of-service vulnerability in FreeBSD by passing invalid arguments to the i386_set_ldt function, causing the system to crash. The code leverages an input-validation flaw in the handling of integers.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: FreeBSD versions 5.2 through 5.5
No auth needed
Prerequisites: Local access to the target FreeBSD system
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (5)

Core 5
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://securitytracker.com/id?1016927
Third Party Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/22064
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/20158
Vendor Advisory third-party-advisory x_refsource_idefense
http://www.idefense.com/intelligence/vulnerabilities/display.php?id=415
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/446946/100/0/threaded

Scores

EPSS 0.0076
EPSS Percentile 50.5%

Details

Status published
Products (5)
freebsd/freebsd 5.2
freebsd/freebsd 5.2.1
freebsd/freebsd 5.3
freebsd/freebsd 5.4
freebsd/freebsd < 5.5
Published Sep 26, 2006
Tracked Since Feb 18, 2026