USN-2794-1: Linux kernel vulnerabilities

5 November 2015

linux vulnerabilities

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

  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel

Details

It was discovered that in certain situations, a directory could be renamed outside of a bind mounted location. An attacker could use this to escape bind mount containment and gain access to sensitive information. (CVE-2015-2925)

Moein Ghasemzadeh discovered that the USB WhiteHEAT serial driver contained hardcoded attributes about the USB devices. An attacker could construct a fake WhiteHEAT USB device that, when inserted, causes a denial of service (system crash). (CVE-2015-5257)

Update instructions

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

Ubuntu 14.04 LTS
linux-image-3.13.0-67-generic - 3.13.0-67.110
linux-image-3.13.0-67-generic-lpae - 3.13.0-67.110
linux-image-3.13.0-67-lowlatency - 3.13.0-67.110
linux-image-3.13.0-67-powerpc-e500 - 3.13.0-67.110
linux-image-3.13.0-67-powerpc-e500mc - 3.13.0-67.110
linux-image-3.13.0-67-powerpc-smp - 3.13.0-67.110
linux-image-3.13.0-67-powerpc64-emb - 3.13.0-67.110
linux-image-3.13.0-67-powerpc64-smp - 3.13.0-67.110

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. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well.

References