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?

No patch is currently available for CVE-2009-3621. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

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

The following references provide additional information about CVE-2009-3621 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Lists
http://lists.opensuse.org/opensuse-security-announce/2009-12/msg00002.html

Mailing List Third Party Advisory
Lists
http://lists.opensuse.org/opensuse-security-announce/2009-12/msg00005.html

Mailing List Third Party Advisory
Lists
http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00000.html

Mailing List Third Party Advisory
Lists
http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00005.html

Mailing List Third Party Advisory
Lists
http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00007.html

Mailing List Third Party Advisory
Lists
http://lists.vmware.com/pipermail/security-announce/2010/000082.html

Mailing List Third Party Advisory
Lkml
http://lkml.org/lkml/2009/10/19/50

Mailing List Third Party Advisory
Kernel.org
http://patchwork.kernel.org/patch/54678/

Exploit Mailing List Third Party Advisory
Secunia
http://secunia.com/advisories/37086

Broken Link
Secunia
http://secunia.com/advisories/37909

Broken Link
Secunia
http://secunia.com/advisories/38017

Broken Link
Secunia
http://secunia.com/advisories/38794

Broken Link
Secunia
http://secunia.com/advisories/38834

Broken Link
Mandriva
http://www.mandriva.com/security/advisories?name=MDVSA-2009:329

Broken Link
Red Hat
http://www.redhat.com/support/errata/RHSA-2009-1670.html

Broken Link
Red Hat
http://www.redhat.com/support/errata/RHSA-2009-1671.html

Broken Link
Ubuntu Security
http://www.ubuntu.com/usn/usn-864-1

Third Party Advisory
Vupen
http://www.vupen.com/english/advisories/2010/0528

Broken Link
Red Hat
https://bugzilla.redhat.com/show_bug.cgi?id=529626

Exploit Issue Tracking Third Party Advisory
Oval
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6895

Third Party Advisory
Oval
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9921

Third Party Advisory
Red Hat
https://rhn.redhat.com/errata/RHSA-2009-1540.html

Third Party Advisory
Red Hat
https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00190.html

Mailing List Third Party Advisory
Kernel patch commit
http://git.kernel.org/?p=linux/kernel/git/davem/net-2.6.git%3Ba=commit%3Bh=77238f2b942b38ab4e7f3aced44084493e4a8675
Patch
Kernel patch commit
http://www.openwall.com/lists/oss-security/2009/10/19/2
Patch
Kernel patch commit
http://www.openwall.com/lists/oss-security/2009/10/19/4
Patch

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?

No patch is currently available for CVE-2009-3621. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
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.
What is Uncontrolled Resource Consumption (CWE-400)?

The product does not properly control the amount of resources it consumes, leading to exhaustion. View CWE-400 on MITRE CWE →