Ubuntu Security Notice 1940-1 – Vasily Kulikov discovered a flaw in the Linux Kernel’s perf tool that allows for privilege escalation. A local user could exploit this flaw to run commands as root when using the perf tool. Michael S. Tsirkin discovered a flaw in how the Linux kernel’s KVM subsystem allocates memory slots for the guest’s address space. A local user could exploit this flaw to gain system privileges or obtain sensitive information from kernel memory. Various other issues were also addressed…. Ubuntu Security Notice 1940-1 – Vasily Kulikov discovered a flaw in the Linux Kernel’s perf tool that allows for privilege escalation. A local user could exploit this flaw to run commands as root when using the perf tool. Michael S. Tsirkin discovered a flaw in how the Linux kernel’s KVM subsystem allocates memory slots for the guest’s address space. A local user could exploit this flaw to gain system privileges or obtain sensitive information from kernel memory. Various other issues were also addressed.

Read more http://packetstormsecurity.com/files/123119/USN-1940-1.txt