The backtrace shows that this is from the pgsql PAM module. A quick check of the code shows that it is assuming that h_addr is always an IPv4 when it may not be, resulting in a potential overflow of the buffer it creates to hold an IP address.
** Package changed: openssh (Ubuntu) => pam-pgsql (Ubuntu) ** Changed in: pam-pgsql (Ubuntu) Importance: Undecided => Medium ** Changed in: pam-pgsql (Ubuntu) Status: New => Confirmed ** Summary changed: - sshd buffer overflow detected crash from certain ip addresses + PAM pgsql buffer overflow when dealing with IPv6 addresses -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. https://bugs.launchpad.net/bugs/722386 Title: PAM pgsql buffer overflow when dealing with long addresses -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs