=========================================================================
Ubuntu Security Notice USN-4116-1
September 02, 2019

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 use-after-free error existed in the block layer
subsystem of the Linux kernel when certain failure conditions occurred. A
local attacker could possibly use this to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2018-20856)

Amit Klein and Benny Pinkas discovered that the Linux kernel did not
sufficiently randomize IP ID values generated for connectionless networking
protocols. A remote attacker could use this to track particular Linux
devices. (CVE-2019-10638)

Praveen Pandey discovered that the Linux kernel did not properly validate
sent signals in some situations on PowerPC systems with transactional
memory disabled. A local attacker could use this to cause a denial of
service. (CVE-2019-13648)

It was discovered that the floppy driver in the Linux kernel did not
properly validate meta data, leading to a buffer overread. A local attacker
could use this to cause a denial of service (system crash).
(CVE-2019-14283)

It was discovered that the floppy driver in the Linux kernel did not
properly validate ioctl() calls, leading to a division-by-zero. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2019-14284)

Jason Wang discovered that an infinite loop vulnerability existed in the
virtio net driver in the Linux kernel. A local attacker in a guest VM could
possibly use this to cause a denial of service in the host system.
(CVE-2019-3900)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1056-kvm      4.4.0-1056.63
  linux-image-4.4.0-1092-aws      4.4.0-1092.103
  linux-image-4.4.0-1120-raspi2   4.4.0-1120.129
  linux-image-4.4.0-1124-snapdragon  4.4.0-1124.130
  linux-image-4.4.0-161-generic   4.4.0-161.189
  linux-image-4.4.0-161-generic-lpae  4.4.0-161.189
  linux-image-4.4.0-161-lowlatency  4.4.0-161.189
  linux-image-4.4.0-161-powerpc-e500mc  4.4.0-161.189
  linux-image-4.4.0-161-powerpc-smp  4.4.0-161.189
  linux-image-4.4.0-161-powerpc64-emb  4.4.0-161.189
  linux-image-4.4.0-161-powerpc64-smp  4.4.0-161.189
  linux-image-aws                 4.4.0.1092.96
  linux-image-generic             4.4.0.161.169
  linux-image-generic-lpae        4.4.0.161.169
  linux-image-kvm                 4.4.0.1056.56
  linux-image-lowlatency          4.4.0.161.169
  linux-image-powerpc-e500mc      4.4.0.161.169
  linux-image-powerpc-smp         4.4.0.161.169
  linux-image-powerpc64-emb       4.4.0.161.169
  linux-image-powerpc64-smp       4.4.0.161.169
  linux-image-raspi2              4.4.0.1120.120
  linux-image-snapdragon          4.4.0.1124.116
  linux-image-virtual             4.4.0.161.169

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/4116-1
  CVE-2018-20856, CVE-2019-10638, CVE-2019-13648, CVE-2019-14283,
  CVE-2019-14284, CVE-2019-3900

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-161.189
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1092.103
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1056.63
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1120.129
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1124.130