Ubuntu Security Notice 4876-1 - Olivier Benjamin and Pawel Wieczorkiewicz discovered a race condition the Xen paravirt block backend in the Linux kernel, leading to a use-after-free vulnerability. An attacker in a guest VM could use this to cause a denial of service in the host OS. It was discovered that the Marvell WiFi-Ex device driver in the Linux kernel did not properly validate ad-hoc SSIDs. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.
b36c8cff2593853a43cf7d61e021f4d82031dfd7518050e64ed110490d8735e4