USN-2872-1: Linux kernel vulnerability

19 January 2016

linux vulnerability

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

  • Ubuntu 15.10

Summary

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

Software Description

  • linux - Linux kernel

Details

Yevgeny Pats discovered that the session keyring implementation in the Linux kernel did not properly reference count when joining an existing session keyring. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code with administrative privileges.

Update instructions

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

Ubuntu 15.10
linux-image-4.2.0-25-generic - 4.2.0-25.30
linux-image-4.2.0-25-generic-lpae - 4.2.0-25.30
linux-image-4.2.0-25-lowlatency - 4.2.0-25.30
linux-image-4.2.0-25-powerpc-e500mc - 4.2.0-25.30
linux-image-4.2.0-25-powerpc-smp - 4.2.0-25.30
linux-image-4.2.0-25-powerpc64-emb - 4.2.0-25.30
linux-image-4.2.0-25-powerpc64-smp - 4.2.0-25.30

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