Red Hat Security Advisory 2017-0892-01 – The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: A race condition flaw was found in the N_HLDC Linux kernel driver when accessing n_hdlc.tbuf list that can lead to double free. A local, unprivileged user able to set the HDLC line discipline on the tty device could use this flaw to increase their privileges on the system.

Ubuntu Security Notice 3258-2 – USN-3258-1 intended to fix a vulnerability in Dovecot. Further investigation revealed that only Dovecot versions 2.2.26 and newer were affected by the vulnerability. Additionally, the change introduced a regression when Dovecot was configured to use the “dict” authentication database. This update reverts the change. It was discovered that Dovecot incorrectly handled some usernames. An attacker could possibly use this issue to cause Dovecot to hang or crash, resulting in a denial of service. Various other issues were also addressed.

Red Hat Security Advisory 2017-0901-01 – In accordance with the Red Hat Directory Server Life Cycle policy, Red Hat Directory Server 9 will be retired as of June 10, 2017 and support will no longer be provided. Accordingly, Red Hat will not provide extended support for this product, including critical impact security patches or urgent priority bug fixes, after this date.