The scm_send function in the scm layer for Linux kernel 2.4.x up to 2.4.28, and 2.6.x up to 2.6.9, allows local users to cause a denial of service (system hang) via crafted auxiliary messages that are passed to the sendmsg function, which causes a deadlock condition.
https://www.ubuntu.com/usn/usn-38-1/
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11816
https://exchange.xforce.ibmcloud.com/vulnerabilities/18483
https://bugzilla.fedora.us/show_bug.cgi?id=2336
http://www.redhat.com/support/errata/RHSA-2005-017.html
http://www.redhat.com/support/errata/RHSA-2005-016.html
http://www.redhat.com/support/errata/RHSA-2004-689.html
http://www.novell.com/linux/security/advisories/2004_44_kernel.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:022
http://www.debian.org/security/2006/dsa-1082
http://www.debian.org/security/2006/dsa-1070
http://www.debian.org/security/2006/dsa-1069
http://www.debian.org/security/2006/dsa-1067
http://secunia.com/advisories/20338
http://secunia.com/advisories/20202
http://secunia.com/advisories/20163