[USN-3820-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3820-1
November 14, 2018

linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities
==========================================================================

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

- Ubuntu 18.04 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-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-oem: Linux kernel for OEM processors
- linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

Felix Wilhelm discovered that the Xen netback driver in the Linux kernel
did not properly perform input validation in some situations. An attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2018-15471)

It was discovered that the generic SCSI driver in the Linux kernel did not
properly enforce permissions on kernel memory access. A local attacker
could use this to expose sensitive information or possibly elevate
privileges. (CVE-2017-13168)

It was discovered that an integer overflow existed in the CD-ROM driver of
the Linux kernel. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2018-16658)

It was discovered that an integer overflow existed in the HID Bluetooth
implementation in the Linux kernel that could lead to a buffer overwrite.
An attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2018-9363)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1024-gcp     4.15.0-1024.25
  linux-image-4.15.0-1026-kvm     4.15.0-1026.26
  linux-image-4.15.0-1026-oem     4.15.0-1026.31
  linux-image-4.15.0-1027-aws     4.15.0-1027.27
  linux-image-4.15.0-1028-raspi2  4.15.0-1028.30
  linux-image-4.15.0-1031-azure   4.15.0-1031.32
  linux-image-4.15.0-39-generic   4.15.0-39.42
  linux-image-4.15.0-39-generic-lpae  4.15.0-39.42
  linux-image-4.15.0-39-lowlatency  4.15.0-39.42
  linux-image-4.15.0-39-snapdragon  4.15.0-39.42
  linux-image-aws                 4.15.0.1027.27
  linux-image-azure               4.15.0.1031.31
  linux-image-gcp                 4.15.0.1024.26
  linux-image-generic             4.15.0.39.41
  linux-image-generic-lpae        4.15.0.39.41
  linux-image-gke                 4.15.0.1024.26
  linux-image-kvm                 4.15.0.1026.26
  linux-image-lowlatency          4.15.0.39.41
  linux-image-oem                 4.15.0.1026.31
  linux-image-raspi2              4.15.0.1028.26
  linux-image-snapdragon          4.15.0.39.41

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-3820-1
  CVE-2017-13168, CVE-2018-15471, CVE-2018-16658, CVE-2018-9363

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-39.42
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1027.27
  https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1031.32
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1024.25
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1026.26
  https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1026.31
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1028.30

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