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Alerts This Week
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Ubuntu 16.04 LTS: USN-3511-1 Critical DoS Threats in Linux-Azure

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Calendar Grey December 8, 2017
Scroller Ubuntu
Debian Security Announcement DSA-4703-1 outlines patches for linux-cloud issues, tackling DOS and remote execution weaknesses.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

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)

Topics%20covered

Topics Covered

security advisory denial of service critical system crash linux-azure

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.11.0-1016-azure   4.11.0-1016.16
  linux-image-azure               4.11.0.1016.16

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-2017-1000405, CVE-2017-16939

Severity
critical
Lowest
Low
Medium
High
Critical

December 08, 2017

Topics%20covered

Topics Covered

security advisory denial of service critical system crash linux-azure

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/4.11.0-1016.16

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