Public Date:
529626: CVE-2009-3621 kernel: AF_UNIX: Fix deadlock on connecting to shutdown socket

The MITRE CVE dictionary describes this issue as:

net/unix/af_unix.c in the Linux kernel 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.

Find out more about CVE-2009-3621 from the MITRE CVE dictionary dictionary and NIST NVD.


Red Hat is aware of this issue and is tracking it via the following bug:

This issue has been rated as having moderate security impact.

It was addressed in Red Hat Enterprise Linux 4, 5 and Red Hat Enterprise MRG via: , and respectively.

This issue is not planned to be fixed in Red Hat Enterprise Linux 3, due to this product being in Production 3 of its maintenance life-cycle, where only qualified security errata of important or critical impact are addressed.

For further information about Errata Support Policy, visit:

CVSS v2 metrics

Base Score 4.9
Base Metrics AV:L/AC:L/Au:N/C:N/I:N/A:C
Access Vector Local
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 4 (kernel) RHSA-2009:1671 2009-12-15
Red Hat Enterprise Linux 5 (kernel) RHSA-2009:1670 2009-12-15
MRG Grid for RHEL 5 Server (kernel-rt) RHSA-2009:1540 2009-11-03
Last Modified

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