[USN-4114-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-4114-1
September 02, 2019

linux, linux-azure, linux-gcp, linux-gke-5.0, linux-hwe, linux-kvm,
linux-raspi2, linux-snapdragon vulnerabilities
==========================================================================

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon processors
- linux-gke-5.0: Linux kernel for Google Container Engine (GKE) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

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 19.04:
  linux-image-5.0.0-1015-gcp      5.0.0-1015.15
  linux-image-5.0.0-1015-kvm      5.0.0-1015.16
  linux-image-5.0.0-1015-raspi2   5.0.0-1015.15
  linux-image-5.0.0-1018-azure    5.0.0-1018.19
  linux-image-5.0.0-1019-snapdragon  5.0.0-1019.20
  linux-image-5.0.0-27-generic    5.0.0-27.28
  linux-image-5.0.0-27-generic-lpae  5.0.0-27.28
  linux-image-5.0.0-27-lowlatency  5.0.0-27.28
  linux-image-azure               5.0.0.1018.17
  linux-image-gcp                 5.0.0.1015.41
  linux-image-generic             5.0.0.27.28
  linux-image-generic-lpae        5.0.0.27.28
  linux-image-gke                 5.0.0.1015.41
  linux-image-kvm                 5.0.0.1015.15
  linux-image-lowlatency          5.0.0.27.28
  linux-image-raspi2              5.0.0.1015.12
  linux-image-snapdragon          5.0.0.1019.12
  linux-image-virtual             5.0.0.27.28

Ubuntu 18.04 LTS:
  linux-image-5.0.0-1015-gke      5.0.0-1015.15~18.04.1
  linux-image-5.0.0-1018-azure    5.0.0-1018.19~18.04.1
  linux-image-5.0.0-27-generic    5.0.0-27.28~18.04.1
  linux-image-5.0.0-27-generic-lpae  5.0.0-27.28~18.04.1
  linux-image-5.0.0-27-lowlatency  5.0.0-27.28~18.04.1
  linux-image-azure               5.0.0.1018.28
  linux-image-generic-hwe-18.04   5.0.0.27.84
  linux-image-generic-lpae-hwe-18.04  5.0.0.27.84
  linux-image-gke-5.0             5.0.0.1015.5
  linux-image-lowlatency-hwe-18.04  5.0.0.27.84
  linux-image-snapdragon-hwe-18.04  5.0.0.27.84
  linux-image-virtual-hwe-18.04   5.0.0.27.84

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/4114-1
  CVE-2019-10638, CVE-2019-13648, CVE-2019-14283, CVE-2019-14284,
  CVE-2019-3900

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.0.0-27.28
  https://launchpad.net/ubuntu/+source/linux-azure/5.0.0-1018.19
  https://launchpad.net/ubuntu/+source/linux-gcp/5.0.0-1015.15
  https://launchpad.net/ubuntu/+source/linux-kvm/5.0.0-1015.16
  https://launchpad.net/ubuntu/+source/linux-raspi2/5.0.0-1015.15
  https://launchpad.net/ubuntu/+source/linux-snapdragon/5.0.0-1019.20
  https://launchpad.net/ubuntu/+source/linux-azure/5.0.0-1018.19~18.04.1
  https://launchpad.net/ubuntu/+source/linux-gke-5.0/5.0.0-1015.15~18.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe/5.0.0-27.28~18.04.1

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