Ubuntu Security Notices
USN-3879-2

USN-3879-2: Linux kernel (Xenial HWE) vulnerabilities

Publication date

4 February 2019

Overview

Several security issues were fixed in the Linux kernel.

Releases

14.04 LTS

Packages

linux-aws - Linux kernel for Amazon Web Services (AWS) systems
linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty

Details

USN-3879-1 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.

Wen Xu discovered that the ext4 file system implementation in the Linux
kernel could possibly perform an out of bounds write when updating the
journal for an inline file. An attacker could use this to construct a
malicious ext4 image that, when mounted, could cause a denial of service
(system crash). (CVE-2018-10883)

Vasily Averin and Pavel Tikhomirov discovered that the cleancache subsystem
of the Linux kernel did not properly initialize new files in some
situations. A local attacker could use this to expose sensitive
information. (CVE-2018-16862)

Wei Wu discovered that the KVM implementation in the Linux kernel did not
properly...

Wei Wu discovered that the KVM implementation in the Linux kernel did not
properly ensure that ioapics were initialized. A local attacker could use
this to cause a denial of service (system crash). (CVE-2018-19407)

Mathias Payer and Hui Peng discovered a use-after-free vulnerability in the
Advanced Linux Sound Architecture (ALSA) subsystem. A physically proximate
attacker could use this to cause a denial of service (system crash).
(CVE-2018-19824)

Hui Peng and Mathias Payer discovered that the USB subsystem in the Linux
kernel did not properly handle size checks when handling an extra USB
descriptor. A physically proximate attacker could use this to cause a
denial of service (system crash). (CVE-2018-20169)

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-4.4.0-1038-aws – 4.4.0-1038.41
	linux-image-4.4.0-142-generic – 4.4.0-142.168~14.04.1
	linux-image-4.4.0-142-generic-lpae – 4.4.0-142.168~14.04.1
	linux-image-4.4.0-142-lowlatency – 4.4.0-142.168~14.04.1
	linux-image-4.4.0-142-powerpc-e500mc – 4.4.0-142.168~14.04.1
	linux-image-4.4.0-142-powerpc-smp – 4.4.0-142.168~14.04.1
	linux-image-4.4.0-142-powerpc64-emb – 4.4.0-142.168~14.04.1
	linux-image-4.4.0-142-powerpc64-smp – 4.4.0-142.168~14.04.1
	linux-image-aws – 4.4.0.1038.38
	linux-image-generic-lpae-lts-xenial – 4.4.0.142.122
	linux-image-generic-lts-xenial – 4.4.0.142.122
	linux-image-lowlatency-lts-xenial – 4.4.0.142.122
	linux-image-powerpc-e500mc-lts-xenial – 4.4.0.142.122
	linux-image-powerpc-smp-lts-xenial – 4.4.0.142.122
	linux-image-powerpc64-emb-lts-xenial – 4.4.0.142.122
	linux-image-powerpc64-smp-lts-xenial – 4.4.0.142.122

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References

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