The first kernel vulnerability patched in Ubuntu 15.04 has been discovered by Benjamin Randazzo and it is related to an information leak in Linux kernel’s md (multiple devices) driver, which could allow a privileged, local attacker to retrieve sensitive information from the kernel.
The second security flaw was discovered by Marc-Andr?? Lureau in Linux kernel’s vhost driver, which did not correctly released the userspace stored log file descriptor, allowing privileged attackers to cause a DoS (Denial of Service) attack.