USN-2751-1: Linux kernel (Vivid HWE) vulnerabilities

Ubuntu Security Notice USN-2751-1

29th September, 2015

linux-lts-vivid 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-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 version:

Ubuntu 14.04 LTS:

linux-image-3.19.0-30-powerpc64-smp 3.19.0-30.33~14.04.1

linux-image-3.19.0-30-generic 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-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

To update your system, please follow these instructions: http://ift.tt/17VXqjU.

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

CVE-2015-5697, CVE-2015-6252

from Ubuntu Security Notices http://ift.tt/1KHH4NF