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Ubuntu Security Notice USN-3219-2

Ubuntu Security Notice USN-3219-2
Posted Mar 8, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3219-2 - USN-3219-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 14.04 LTS for Ubuntu 12.04 LTS. Alexander Popov discovered that the N_HDLC line discipline implementation in the Linux kernel contained a double-free vulnerability. A local attacker could use this to cause a denial of service or possibly gain administrative privileges. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-2636
SHA-256 | b177c99480d5bed299174af41028842bc475c66bcc97d6ec39280073ab1dc729

Ubuntu Security Notice USN-3219-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3219-2
March 08, 2017

linux-lts-trusty vulnerability
==========================================================================

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

- Ubuntu 12.04 LTS

Summary:

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

Software Description:
- linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise

Details:

USN-3219-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for Ubuntu
12.04 LTS.

Alexander Popov discovered that the N_HDLC line discipline implementation
in the Linux kernel contained a double-free vulnerability. A local attacker
could use this to cause a denial of service (system crash) or possibly gain
administrative privileges.

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.13.0-112-generic 3.13.0-112.159~precise1
linux-image-3.13.0-112-generic-lpae 3.13.0-112.159~precise1
linux-image-generic-lpae-lts-trusty 3.13.0.112.103
linux-image-generic-lts-trusty 3.13.0.112.103

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-3219-2
http://www.ubuntu.com/usn/usn-3219-1
CVE-2017-2636

Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-112.159~precise1

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