USN-3879-1: Linux kernel vulnerabilities

linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities

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

Ubuntu 16.04 LTS

Summary

Several security issues were fixed in the Linux kernel.

Software Description

linux – Linux kernel
linux-aws – Linux kernel for Amazon Web Services (AWS) systems
linux-kvm – Linux kernel for cloud environments
linux-raspi2 – Linux kernel for Raspberry Pi 2
linux-snapdragon – Linux kernel for Snapdragon processors

Details

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 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

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

Ubuntu 16.04 LTS: linux-image-4.4.0-1040-kvm – 4.4.0-1040.46; linux-image-4.4.0-1075-aws – 4.4.0-1075.85; linux-image-4.4.0-1103-raspi2 – 4.4.0-1103.111; linux-image-4.4.0-1107-snapdragon – 4.4.0-1107.112; linux-image-4.4.0-142-generic – 4.4.0-142.168; linux-image-4.4.0-142-generic-lpae – 4.4.0-142.168; linux-image-4.4.0-142-lowlatency – 4.4.0-142.168; linux-image-4.4.0-142-powerpc-e500mc – 4.4.0-142.168; linux-image-4.4.0-142-powerpc-smp – 4.4.0-142.168; linux-image-4.4.0-142-powerpc64-emb – 4.4.0-142.168; linux-image-4.4.0-142-powerpc64-smp – 4.4.0-142.168; linux-image-aws – 4.4.0.1075.77; linux-image-generic – 4.4.0.142.148; linux-image-generic-lpae – 4.4.0.142.148; linux-image-kvm – 4.4.0.1040.39; linux-image-lowlatency – 4.4.0.142.148; linux-image-powerpc-e500mc – 4.4.0.142.148; linux-image-powerpc-smp – 4.4.0.142.148; linux-image-powerpc64-emb – 4.4.0.142.148; linux-image-powerpc64-smp – 4.4.0.142.148; linux-image-raspi2 – 4.4.0.1103.103; linux-image-snapdragon – 4.4.0.1107.99

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

Source: USN-3879-1: Linux kernel vulnerabilities

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