Ubuntu Security Notices
USN-3219-1

USN-3219-1: Linux kernel vulnerability

Publication date

7 March 2017

Overview

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

Releases

14.04 LTS

Packages

linux - Linux kernel

Details

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

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
14.04 trusty	linux-image-3.13.0-112-generic – 3.13.0-112.159
	linux-image-3.13.0-112-generic-lpae – 3.13.0-112.159
	linux-image-3.13.0-112-lowlatency – 3.13.0-112.159
	linux-image-3.13.0-112-powerpc-e500 – 3.13.0-112.159
	linux-image-3.13.0-112-powerpc-e500mc – 3.13.0-112.159
	linux-image-3.13.0-112-powerpc-smp – 3.13.0-112.159
	linux-image-3.13.0-112-powerpc64-emb – 3.13.0-112.159
	linux-image-3.13.0-112-powerpc64-smp – 3.13.0-112.159

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References

CVE-2017-2636

CVE-2017-2636

Have additional questions?

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