USN-3128-2: Linux kernel (Xenial HWE) vulnerability

Ubuntu Security Notice USN-3128-2

11th November, 2016

linux-lts-xenial vulnerability

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

Ubuntu 14.04 LTS

Summary

The system could be made to crash under certain conditions.

Software description

linux-lts-xenial
– Linux hardware enablement kernel from Xenial for Trusty

Details

USN-3128-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu
14.04 LTS.

Ondrej Kozina discovered that the keyring interface in the Linux kernel
contained a buffer overflow when displaying timeout events via the
/proc/keys interface. A local attacker could use this to cause a denial of
service (system crash).

Update instructions

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

Ubuntu 14.04 LTS:: linux-image-powerpc-smp-lts-xenial

4.4.0.47.34; linux-image-4.4.0-47-powerpc64-emb

4.4.0-47.68~14.04.1; linux-image-4.4.0-47-lowlatency

4.4.0-47.68~14.04.1; linux-image-4.4.0-47-powerpc64-smp

4.4.0-47.68~14.04.1; linux-image-4.4.0-47-generic

4.4.0-47.68~14.04.1; linux-image-generic-lpae-lts-xenial

4.4.0.47.34; linux-image-4.4.0-47-powerpc-smp

4.4.0-47.68~14.04.1; linux-image-lowlatency-lts-xenial

4.4.0.47.34; linux-image-generic-lts-xenial

4.4.0.47.34; linux-image-4.4.0-47-generic-lpae

4.4.0-47.68~14.04.1; linux-image-powerpc64-smp-lts-xenial

4.4.0.47.34; linux-image-powerpc64-emb-lts-xenial

4.4.0.47.34; linux-image-powerpc-e500mc-lts-xenial

4.4.0.47.34; linux-image-4.4.0-47-powerpc-e500mc

4.4.0-47.68~14.04.1

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

CVE-2016-7042

Source: USN-3128-2: Linux kernel (Xenial HWE) vulnerability

지락문화예술공작단