2.1 - USN-2751-1

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-lts-vivid: Linux hardware enablement kernel from Vivid

Details:

Benjamin Randazzo discovered an information leak in the md (multiple device) driver when the bitmap_info.file is disabled. A local privileged attacker could use this to obtain sensitive information from the kernel. (CVE-2015-5697)

Marc-André Lureau discovered that the vhost driver did not properly release the userspace provided log file descriptor. A privileged attacker could use this to cause a denial of service (resource exhaustion). (CVE-2015-6252)

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-3.19.0-30-generic 3.19.0-30.33~14.04.1
linux-image-3.19.0-30-generic-lpae 3.19.0-30.33~14.04.1
linux-image-3.19.0-30-lowlatency 3.19.0-30.33~14.04.1
linux-image-3.19.0-30-powerpc-e500mc 3.19.0-30.33~14.04.1
linux-image-3.19.0-30-powerpc-smp 3.19.0-30.33~14.04.1
linux-image-3.19.0-30-powerpc64-emb 3.19.0-30.33~14.04.1
linux-image-3.19.0-30-powerpc64-smp 3.19.0-30.33~14.04.1

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:
http://www.ubuntu.com/usn/usn-2751-1
CVE-2015-5697, CVE-2015-6252

Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-vivid/3.19.0-30.33~14.04.1