What is CVE-2009-3621?

CVE-2009-3621 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Uncontrolled Resource Consumption flaw (CWE-400). CVE-2009-3621 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2009-3621?

CVE-2009-3621 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2009-3621?

Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2009-3621 patch availability.

Is CVE-2009-3621 actively exploited?

CVE-2009-3621 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Uncontrolled Resource Consumption (CWE-400)?

The product does not properly control the amount of resources it consumes, leading to exhaustion. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/400.html

CVE-2009-3621

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 shutdown operation on this socket, and then performing a series of connect operations to this socket.

Package Linux Kernel

Published 2009-10-22

Last modified 2026-04-23

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-400

CVE-2009-3621 is a Uncontrolled Resource Consumption vulnerability

What is Uncontrolled Resource Consumption?

The product does not properly control the amount of resources it consumes, leading to exhaustion. Learn more on MITRE CWE

References

26 total

Kernel.org
http://patchwork.kernel.org/patch/54678/

Exploit Mailing List Third Party Advisory
Openwall
http://www.openwall.com/lists/oss-security/2009/10/19/2

Exploit Mailing List Patch Third Party Advisory
Openwall
http://www.openwall.com/lists/oss-security/2009/10/19/4

Exploit Mailing List Patch Third Party Advisory
Red Hat
https://bugzilla.redhat.com/show_bug.cgi?id=529626

Exploit Issue Tracking Third Party Advisory
Kernel Git
http://git.kernel.org/?p=linux/kernel/git/davem/net-2.6.git%3Ba=commit%3Bh=77238f2b942b38ab4e7f3aced44084493e4a8675

Showing 5 of 26 references View all on NVD

Details

CVE ID CVE-2009-3621

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2009-10-22

Modified 2026-04-23

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2009-3621?

CVE-2009-3621 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Uncontrolled Resource Consumption flaw (CWE-400) . CVE-2009-3621 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2009-3621?

CVE-2009-3621 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2009-3621?

Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2009-3621 patch availability.
Is CVE-2009-3621 actively exploited?

No. CVE-2009-3621 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.