============================================================================
Ubuntu Security Notice USN-2601-1
May 05, 2015

linux vulnerability
============================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 15.04

Summary:

The system could be made to run programs as an administrator.

Software Description:
- linux: Linux kernel

Details:

A race condition between chown() and execve() was discovered in the Linux
kernel. A local attacker could exploit this race by using chown on a
setuid-user-binary to gain administrative privileges.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 15.04:
  linux-image-3.19.0-16-generic   3.19.0-16.16
  linux-image-3.19.0-16-generic-lpae  3.19.0-16.16
  linux-image-3.19.0-16-lowlatency  3.19.0-16.16
  linux-image-3.19.0-16-powerpc-e500mc  3.19.0-16.16
  linux-image-3.19.0-16-powerpc-smp  3.19.0-16.16
  linux-image-3.19.0-16-powerpc64-emb  3.19.0-16.16
  linux-image-3.19.0-16-powerpc64-smp  3.19.0-16.16

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References:
  http://www.ubuntu.com/usn/usn-2601-1
  CVE-2015-3339

Package Information:
  https://launchpad.net/ubuntu/+source/linux/3.19.0-16.16