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CVE-2009-3621

5.5 · MEDIUM

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 sh…

Published Oct 22, 2009linuxCWE-400EPSS 0.99%

Overview

CVE-2009-3621 is a medium-severity vulnerability affecting linux linux_kernel. It was published on October 22, 2009 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
linuxlinux_kernel0Affected

References

Refgit.kernel.org/?p=linux/kernel/git/davem/net-2.6.git%3Ba=commit%3Bh=77238f2b942b38ab4e7f3aced44084493e4a8675Reflists.opensuse.org/opensuse-security-announce/2009-12/msg00002.htmlReflists.opensuse.org/opensuse-security-announce/2009-12/msg00005.htmlReflists.opensuse.org/opensuse-security-announce/2010-01/msg00000.htmlReflists.opensuse.org/opensuse-security-announce/2010-02/msg00005.htmlReflists.opensuse.org/opensuse-security-announce/2010-02/msg00007.htmlReflists.vmware.com/pipermail/security-announce/2010/000082.htmlReflkml.org/lkml/2009/10/19/50Refpatchwork.kernel.org/patch/54678/Refsecunia.com/advisories/37086

How CyberStrike helps

Frequently asked questions

What is CVE-2009-3621?

CVE-2009-3621 is a medium-severity vulnerability affecting linux linux_kernel. It was published on October 22, 2009 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2009-3621?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2009-3621?

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-3621?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-3621 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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