CVE-2009-3621: Canonical Ubuntu Linux

Medium severity, CVSS 5.5. EPSS: 1% chance of exploitation in the next 30 days.

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.

Affected products

• Canonical Ubuntu Linux: version 6.06 only; version 8.04 only; version 8.10 only; version 9.04 only; version 9.10 only
• Fedoraproject Fedora: version 10 only
• Linux Linux Kernel: up to and including 2.6.31.4
• Opensuse Opensuse: version 11.0 only; version 11.2 only
• Suse Suse Linux Enterprise Desktop: version 10 only
• Suse Suse Linux Enterprise Server: version 10 only
• VMware Esx: version 4.0 only
• VMware Vma: version 4.0 only

Published 2009-10-22. Last modified 2026-06-16.