USN-3404-2: Linux kernel (HWE) vulnerability

Ubuntu Security Notice USN-3404-2

28th August, 2017

linux-hwe vulnerability

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

  • Ubuntu 16.04 LTS

Summary

The system could be made to crash under certain conditions.

Software description

  • linux-hwe - Linux hardware enablement (HWE) kernel

Details

USN-3404-1 fixed a vulnerability in the Linux kernel for Ubuntu 17.04.
This update provides the corresponding updates for the Linux Hardware
Enablement (HWE) kernel from Ubuntu 17.04 for Ubuntu 16.04 LTS.

A reference count bug was discovered in the Linux kernel ipx protocol
stack. A local attacker could exploit this flaw to cause a denial of
service or possibly other unspecified problems.

Update instructions

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

Ubuntu 16.04 LTS:
linux-image-4.10.0-33-generic 4.10.0-33.37~16.04.1
linux-image-4.10.0-33-lowlatency 4.10.0-33.37~16.04.1
linux-image-generic-hwe-16.04 4.10.0.33.35
linux-image-lowlatency-hwe-16.04 4.10.0.33.35
linux-image-4.10.0-33-generic-lpae 4.10.0-33.37~16.04.1
linux-image-generic-lpae-hwe-16.04 4.10.0.33.35

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-2017-7487