A use-after-free flaw was found in OpenSSH. An attacker able to fully compromise a non-privileged pre-authentication process using a different flaw could possibly cause sshd to crash or execute arbitrary code with root privileges.
Unitrends Risk Assessment: None with security updates 4/26/17 or later
Fixed in openssh-5.3p1-117.el6 and later.
LINK TO ADVISORIES