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Ubuntu Security Notice USN-2872-1

Ubuntu Security Notice USN-2872-1
Posted Jan 19, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2872-1 - Yevgeny Pats discovered that the session keyring implementation in the Linux kernel did not properly reference count when joining an existing session keyring. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code with administrative privileges.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2016-0728
MD5 | 299d9834b57075b2ff0569336fe22443

Ubuntu Security Notice USN-2872-1

Change Mirror Download
Content-Disposition: inline

==========================================================================Ubuntu Security Notice USN-2872-1
January 19, 2016

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

- Ubuntu 15.10

Summary:

The system could be made to crash or run programs as an administrator.

Software Description:
- linux: Linux kernel

Details:

Yevgeny Pats discovered that the session keyring implementation in the
Linux kernel did not properly reference count when joining an existing
session keyring. A local attacker could use this 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 15.10:
linux-image-4.2.0-25-generic 4.2.0-25.30
linux-image-4.2.0-25-generic-lpae 4.2.0-25.30
linux-image-4.2.0-25-lowlatency 4.2.0-25.30
linux-image-4.2.0-25-powerpc-e500mc 4.2.0-25.30
linux-image-4.2.0-25-powerpc-smp 4.2.0-25.30
linux-image-4.2.0-25-powerpc64-emb 4.2.0-25.30
linux-image-4.2.0-25-powerpc64-smp 4.2.0-25.30

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:
http://www.ubuntu.com/usn/usn-2872-1
CVE-2016-0728

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.2.0-25.30

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