Ubuntu Security Notice USN-2852-1
19th December, 2015
linux-raspi2 vulnerability
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 15.10
Summary
The system could be made to provide access outside of namespace sandbox.
Software description
- linux-raspi2
- Linux kernel for Raspberry Pi 2
Details
Jann Horn discovered a ptrace issue with user namespaces in the Linux
kernel. The namespace owner could potentially exploit this flaw by ptracing
a root owned process entering the user namespace to elevate its privileges
and potentially gain access outside of the namespace.
(http://bugs.launchpad.net/bugs/1527374)
Update instructions
The problem can be corrected by updating your system to the following
package version:
- Ubuntu 15.10:
linux-image-4.2.0-1017-raspi2
4.2.0-1017.24
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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References
CVE-2015-NNN2