1. Ubuntu Security Notices
  2. USN-3189-2

USN-3189-2: Linux kernel (Xenial HWE) vulnerabilities

Publication date

3 February 2017

Overview

Several security issues were fixed in the kernel.

Releases

Packages

Details

USN-3189-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu
14.04 LTS.

Mikulas Patocka discovered that the asynchronous multibuffer cryptographic
daemon (mcryptd) in the Linux kernel did not properly handle being invoked
with incompatible algorithms. A local attacker could use this to cause a
denial of service (system crash). (CVE-2016-10147)

Qidan He discovered that the ICMP implementation in the Linux kernel did
not properly check the size of an ICMP header. A local attacker with
CAP_NET_ADMIN could use this to expose sensitive information.
(CVE-2016-8399)

USN-3189-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu
14.04 LTS.

Mikulas Patocka discovered that the asynchronous multibuffer cryptographic
daemon (mcryptd) in the Linux kernel did not properly handle being invoked
with incompatible algorithms. A local attacker could use this to cause a
denial of service (system crash). (CVE-2016-10147)

Qidan He discovered that the ICMP implementation in the Linux kernel did
not properly check the size of an ICMP header. A local attacker with
CAP_NET_ADMIN could use this to expose sensitive information.
(CVE-2016-8399)

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-4.4.0-62-generic –  4.4.0-62.83~14.04.1
linux-image-4.4.0-62-generic-lpae –  4.4.0-62.83~14.04.1
linux-image-4.4.0-62-lowlatency –  4.4.0-62.83~14.04.1
linux-image-4.4.0-62-powerpc-e500mc –  4.4.0-62.83~14.04.1
linux-image-4.4.0-62-powerpc-smp –  4.4.0-62.83~14.04.1
linux-image-4.4.0-62-powerpc64-emb –  4.4.0-62.83~14.04.1
linux-image-4.4.0-62-powerpc64-smp –  4.4.0-62.83~14.04.1

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References

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