USN-2646-1: Linux kernel vulnerability
15 June 2015
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.10
The system could be made to run programs as an administrator.
- linux - Linux kernel
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.
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 14.10
- linux-image-3.16.0-41-generic - 3.16.0-41.55
- linux-image-3.16.0-41-generic-lpae - 3.16.0-41.55
- linux-image-3.16.0-41-lowlatency - 3.16.0-41.55
- linux-image-3.16.0-41-powerpc-e500mc - 3.16.0-41.55
- linux-image-3.16.0-41-powerpc-smp - 3.16.0-41.55
- linux-image-3.16.0-41-powerpc64-emb - 3.16.0-41.55
- linux-image-3.16.0-41-powerpc64-smp - 3.16.0-41.55
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
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.