Ubuntu Security Notice 387-1 - Dovecot was discovered to have an error when handling its index cache files. This error could be exploited by authenticated POP and IMAP users to cause a crash of the Dovecot server, or possibly to execute arbitrary code. Only servers using the non-default option "mmap_disable=yes" were vulnerable.
65853c23c7c8d92652e693162b76d16396cdf26d972f1d2c7edd4cc330ddd8b4