Ubuntu Security Notices
USN-2643-1

USN-2643-1: Linux kernel vulnerability

Publication date

15 June 2015

Overview

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

Releases

14.04 LTS

Packages

linux - Linux kernel

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

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

Learn more about how to get the fixes.

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.

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

Ubuntu Release	Package Version
14.04 trusty	linux-image-3.13.0-55-generic – 3.13.0-55.92
	linux-image-3.13.0-55-generic-lpae – 3.13.0-55.92
	linux-image-3.13.0-55-lowlatency – 3.13.0-55.92
	linux-image-3.13.0-55-powerpc-e500 – 3.13.0-55.92
	linux-image-3.13.0-55-powerpc-e500mc – 3.13.0-55.92
	linux-image-3.13.0-55-powerpc-smp – 3.13.0-55.92
	linux-image-3.13.0-55-powerpc64-emb – 3.13.0-55.92
	linux-image-3.13.0-55-powerpc64-smp – 3.13.0-55.92

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References

CVE-2015-1328

CVE-2015-1328

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