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Ubuntu Security Notice USN-2751-1

Ubuntu Security Notice USN-2751-1
Posted Sep 30, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2751-1 - 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. 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). Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-5697, CVE-2015-6252
SHA-256 | 405924714667abca6dd52a948eb668373582fe5cba40c4a1e880bf55c253e392

Ubuntu Security Notice USN-2751-1

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Content-Disposition: inline


============================================================================
Ubuntu Security Notice USN-2751-1
September 29, 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-Andr=E9 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
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