USN-2999-1: Linux kernel vulnerability

10 June 2016

linux 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 - Linux kernel

Details

Jann Horn discovered that eCryptfs improperly attempted to use the mmap() handler of a lower filesystem that did not implement one, causing a recursive page fault to occur. A local unprivileged attacker could use 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-3.13.0-88-generic - 3.13.0-88.135
linux-image-3.13.0-88-generic-lpae - 3.13.0-88.135
linux-image-3.13.0-88-lowlatency - 3.13.0-88.135
linux-image-3.13.0-88-powerpc-e500 - 3.13.0-88.135
linux-image-3.13.0-88-powerpc-e500mc - 3.13.0-88.135
linux-image-3.13.0-88-powerpc-smp - 3.13.0-88.135
linux-image-3.13.0-88-powerpc64-emb - 3.13.0-88.135
linux-image-3.13.0-88-powerpc64-smp - 3.13.0-88.135

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