CVE-2009-3621 Denial of service in n/a

What is CVE-2009-3621?

CVE-2009-3621 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 22 Oct 2009. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-400

Which versions are affected by CVE-2009-3621?

It affects 8 products.

Products include Canonical Ubuntu Linux, Fedoraproject Fedora, Linux kernel, Opensuse Opensuse, Suse Suse Linux Enterprise Desktop, Suse Suse Linux Enterprise Server and 2 more.

How do I fix CVE-2009-3621?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2009-3621 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-3621 exists.

Public exploit code: 1 Exploit-DB entry.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-g479-4r8w-jx3w.