[USN-3848-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3848-1
December 20, 2018

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:

It was discovered that a double free existed in the AMD GPIO driver in the
Linux kernel. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2017-18174)

It was discovered that an integer overrun vulnerability existed in the
POSIX timers implementation in the Linux kernel. A local attacker could use
this to cause a denial of service. (CVE-2018-12896)

Kanda Motohiro discovered that writing extended attributes to an XFS file
system in the Linux kernel in certain situations could cause an error
condition to occur. A local attacker could use this to cause a denial of
service. (CVE-2018-18690)

It was discovered that an integer overflow vulnerability existed in the
CDROM driver of the Linux kernel. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2018-18710)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1039-kvm      4.4.0-1039.45
  linux-image-4.4.0-1074-aws      4.4.0-1074.84
  linux-image-4.4.0-1102-raspi2   4.4.0-1102.110
  linux-image-4.4.0-1106-snapdragon  4.4.0-1106.111
  linux-image-4.4.0-141-generic   4.4.0-141.167
  linux-image-4.4.0-141-generic-lpae  4.4.0-141.167
  linux-image-4.4.0-141-lowlatency  4.4.0-141.167
  linux-image-4.4.0-141-powerpc-e500mc  4.4.0-141.167
  linux-image-4.4.0-141-powerpc-smp  4.4.0-141.167
  linux-image-4.4.0-141-powerpc64-emb  4.4.0-141.167
  linux-image-4.4.0-141-powerpc64-smp  4.4.0-141.167
  linux-image-aws                 4.4.0.1074.76
  linux-image-generic             4.4.0.141.147
  linux-image-generic-lpae        4.4.0.141.147
  linux-image-kvm                 4.4.0.1039.38
  linux-image-lowlatency          4.4.0.141.147
  linux-image-powerpc-e500mc      4.4.0.141.147
  linux-image-powerpc-smp         4.4.0.141.147
  linux-image-powerpc64-emb       4.4.0.141.147
  linux-image-powerpc64-smp       4.4.0.141.147
  linux-image-raspi2              4.4.0.1102.102
  linux-image-snapdragon          4.4.0.1106.98

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://usn.ubuntu.com/usn/usn-3848-1
  CVE-2017-18174, CVE-2018-12896, CVE-2018-18690, CVE-2018-18710

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-141.167
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1074.84
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1039.45
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1102.110
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1106.111

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