USN-2871-2: Linux kernel (Vivid HWE) vulnerability

19 January 2016

linux-lts-vivid vulnerability

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

  • Ubuntu 14.04 LTS

Summary

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

Software Description

  • linux-lts-vivid - Linux hardware enablement kernel from Vivid

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 14.04 LTS
linux-image-3.19.0-47-generic - 3.19.0-47.53~14.04.1
linux-image-3.19.0-47-generic-lpae - 3.19.0-47.53~14.04.1
linux-image-3.19.0-47-lowlatency - 3.19.0-47.53~14.04.1
linux-image-3.19.0-47-powerpc-e500mc - 3.19.0-47.53~14.04.1
linux-image-3.19.0-47-powerpc-smp - 3.19.0-47.53~14.04.1
linux-image-3.19.0-47-powerpc64-emb - 3.19.0-47.53~14.04.1
linux-image-3.19.0-47-powerpc64-smp - 3.19.0-47.53~14.04.1

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