USN-2858-3: Linux kernel (Raspberry Pi 2) vulnerability

Ubuntu Security Notice USN-2858-3

5th January, 2016

linux-raspi2 vulnerability

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

• Ubuntu 15.10

Summary

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

Software description

• linux-raspi2
  – Linux kernel for Raspberry Pi 2

Details

Nathan Williams discovered that overlayfs in the Linux kernel incorrectly
handled setattr operations. A local unprivileged attacker could use this to
create files with administrative permission attributes and execute
arbitrary code with elevated privileges.

Update instructions

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

Ubuntu 15.10:

linux-image-4.2.0-1018-raspi2

4.2.0-1018.25

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-2015-8660

Source: ubuntu-usn