Ubuntu Security Notices
USN-3292-2

USN-3292-2: Linux kernel (HWE) vulnerability

Publication date

17 May 2017

Overview

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

Releases

16.04 LTS

Packages

linux-hwe - Linux hardware enablement (HWE) kernel

Details

USN-3292-1 fixed a vulnerability in the Linux kernel for Ubuntu 16.10.
This update provides the corresponding updates for the Linux Hardware
Enablement (HWE) kernel from Ubuntu 16.10 for Ubuntu 16.04 LTS.

Jason Donenfeld discovered a heap overflow in the MACsec module in the
Linux kernel. An attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code.

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release	Package Version
16.04 xenial	linux-image-4.8.0-52-generic – 4.8.0-52.55~16.04.1
	linux-image-4.8.0-52-generic-lpae – 4.8.0-52.55~16.04.1
	linux-image-4.8.0-52-lowlatency – 4.8.0-52.55~16.04.1

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References

CVE-2017-7477

CVE-2017-7477

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