CVE-2011-2189

Publication date 10 October 2011

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

net/core/net_namespace.c in the Linux kernel 2.6.32 and earlier does not properly handle a high rate of creation and cleanup of network namespaces, which makes it easier for remote attackers to cause a denial of service (memory consumption) via requests to a daemon that requires a separate namespace per connection, as demonstrated by vsftpd.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
vsftpd	11.10 oneiric	Fixed 2.3.2-3ubuntu5.1
	11.04 natty	Fixed 2.3.2-3ubuntu4.1
	10.10 maverick	Fixed 2.3.0~pre2-4ubuntu2.3
	10.04 LTS lucid	Fixed 2.2.2-3ubuntu6.3
	8.04 LTS hardy	Ignored end of life

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
vsftpd	Vendor: http://www.debian.org/security/2011/dsa-2305

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.5 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	None
Integrity impact	None
Availability impact	High

Scores

Parameter	Value
Base score	7.5 · High
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-1288-1
vsftpd vulnerability
7 December 2011

Other references

https://www.cve.org/CVERecord?id=CVE-2011-2189