[USN-3732-1] Linux kernel vulnerability

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3732-1
August 06, 2018

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

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

- Ubuntu 18.04 LTS

Summary:

The system could be made unavailable if it received specially crafted
network traffic.

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:

Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel
performed algorithmically expensive operations in some situations when
handling incoming packets. A remote attacker could use this to cause a
denial of service.

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1013-oem     4.15.0-1013.16
  linux-image-4.15.0-1015-gcp     4.15.0-1015.15
  linux-image-4.15.0-1017-aws     4.15.0-1017.17
  linux-image-4.15.0-1017-kvm     4.15.0-1017.17
  linux-image-4.15.0-1018-raspi2  4.15.0-1018.19
  linux-image-4.15.0-1019-azure   4.15.0-1019.19
  linux-image-4.15.0-30-generic   4.15.0-30.32
  linux-image-4.15.0-30-generic-lpae  4.15.0-30.32
  linux-image-4.15.0-30-lowlatency  4.15.0-30.32
  linux-image-4.15.0-30-snapdragon  4.15.0-30.32
  linux-image-aws                 4.15.0.1017.17
  linux-image-azure               4.15.0.1019.19
  linux-image-azure-edge          4.15.0.1019.19
  linux-image-gcp                 4.15.0.1015.17
  linux-image-generic             4.15.0.30.32
  linux-image-generic-lpae        4.15.0.30.32
  linux-image-gke                 4.15.0.1015.17
  linux-image-kvm                 4.15.0.1017.17
  linux-image-lowlatency          4.15.0.30.32
  linux-image-oem                 4.15.0.1013.15
  linux-image-raspi2              4.15.0.1018.16
  linux-image-snapdragon          4.15.0.30.32

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-3732-1
  CVE-2018-5390

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-30.32
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1017.17
  https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1019.19
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1015.15
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1017.17
  https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1013.16
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1018.19

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