USN-2643-1: Linux kernel vulnerability

15 June 2015

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

Releases

Packages

Details

Philip Pettersson discovered a privilege escalation when using overlayfs
mounts inside of user namespaces. A local user could exploit this flaw to
gain administrative privileges on the system.

Update instructions

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

Ubuntu 14.04

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

Related notices

  • USN-2640-1: linux-image-3.2.0-86-highbank, linux-image-3.2.0-86-powerpc-smp, linux-image-3.2.0-86-generic-pae, linux-image-3.2.0-86-generic, linux-image-3.2.0-86-omap, linux-image-3.2.0-86-powerpc64-smp, linux-image-3.2.0-86-virtual, linux
  • USN-2641-1: linux-ti-omap4, linux-image-3.2.0-1466-omap4
  • USN-2642-1: linux-lts-trusty, linux-image-3.13.0-55-generic, linux-image-3.13.0-55-generic-lpae
  • USN-2644-1: linux-image-3.16.0-41-powerpc-e500mc, linux-image-3.16.0-41-lowlatency, linux-image-3.16.0-41-generic-lpae, linux-image-3.16.0-41-powerpc-smp, linux-image-3.16.0-41-generic, linux-image-3.16.0-41-powerpc64-emb, linux-image-3.16.0-41-powerpc64-smp, linux-image-extra-3.16.0-41-generic, linux-lts-utopic
  • USN-2645-1: linux-image-extra-3.19.0-21-generic, linux-image-3.19.0-21-powerpc-smp, linux-image-3.19.0-21-generic, linux-image-3.19.0-21-powerpc64-emb, linux-image-3.19.0-21-powerpc64-smp, linux-image-3.19.0-21-powerpc-e500mc, linux-lts-vivid, linux-image-3.19.0-21-lowlatency, linux-image-3.19.0-21-generic-lpae
  • USN-2646-1: linux-image-3.16.0-41-powerpc-e500mc, linux-image-3.16.0-41-lowlatency, linux-image-3.16.0-41-generic-lpae, linux-image-3.16.0-41-powerpc-smp, linux-image-3.16.0-41-generic, linux-image-3.16.0-41-powerpc64-emb, linux-image-3.16.0-41-powerpc64-smp, linux
  • USN-2647-1: linux-image-3.19.0-21-powerpc-smp, linux-image-3.19.0-21-generic, linux-image-3.19.0-21-powerpc64-emb, linux-image-3.19.0-21-powerpc64-smp, linux-image-3.19.0-21-powerpc-e500mc, linux-image-3.19.0-21-lowlatency, linux-image-3.19.0-21-generic-lpae, linux