[USN-3510-1] Linux kernel vulnerabilities

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Ubuntu Security Notice USN-3510-1
December 08, 2017

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

- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel

Details:

Mohamed Ghannam discovered that a use-after-free vulnerability existed in
the Netlink subsystem (XFRM) in the Linux kernel. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2017-16939)

It was discovered that the Linux kernel did not properly handle copy-on-
write of transparent huge pages. A local attacker could use this to cause a
denial of service (application crashes) or possibly gain administrative
privileges. (CVE-2017-1000405)

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-3.13.0-137-generic 3.13.0-137.186
linux-image-3.13.0-137-generic-lpae 3.13.0-137.186
linux-image-3.13.0-137-lowlatency 3.13.0-137.186
linux-image-3.13.0-137-powerpc-e500 3.13.0-137.186
linux-image-3.13.0-137-powerpc-e500mc 3.13.0-137.186
linux-image-3.13.0-137-powerpc-smp 3.13.0-137.186
linux-image-3.13.0-137-powerpc64-emb 3.13.0-137.186
linux-image-3.13.0-137-powerpc64-smp 3.13.0-137.186
linux-image-generic 3.13.0.137.146
linux-image-generic-lpae 3.13.0.137.146
linux-image-lowlatency 3.13.0.137.146
linux-image-powerpc-e500 3.13.0.137.146
linux-image-powerpc-e500mc 3.13.0.137.146
linux-image-powerpc-smp 3.13.0.137.146
linux-image-powerpc64-emb 3.13.0.137.146
linux-image-powerpc64-smp 3.13.0.137.146

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:
https://www.ubuntu.com/usn/usn-3510-1
CVE-2017-1000405, CVE-2017-16939

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.13.0-137.186