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.
http://lists.opensuse.org/opensuse-security-announce/2009-12/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2009-12/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00007.html
http://lists.vmware.com/pipermail/security-announce/2010/000082.html
http://patchwork.kernel.org/patch/54678/
https://bugzilla.redhat.com/show_bug.cgi?id=529626
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6895
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9921
https://rhn.redhat.com/errata/RHSA-2009-1540.html
https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00190.html
http://www.openwall.com/lists/oss-security/2009/10/19/2