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             AUSCERT External Security Bulletin Redistribution

                 USN-4209-1: Linux kernel vulnerabilities
                              3 December 2019


        AusCERT Security Bulletin Summary

Product:           kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Root Compromise   -- Existing Account
                   Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-19076 CVE-2019-16746 CVE-2019-15794

Reference:         ESB-2019.4274

Original Bulletin: 

- --------------------------BEGIN INCLUDED TEXT--------------------

USN-4209-1: Linux kernel vulnerabilities
2 December 2019

linux, linux-aws, linux-aws-5.0, linux-gcp, linux-gke-5.0, linux-hwe, linux-kvm, linux-oem-osp1, linux-oracle, linux-oracle-5.0, linux-raspi2 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:

  o Ubuntu 19.04
  o Ubuntu 18.04 LTS


Several security issues were fixed in the Linux kernel.

Software Description

  o linux - Linux kernel
  o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  o linux-kvm - Linux kernel for cloud environments
  o linux-oracle - Linux kernel for Oracle Cloud systems
  o linux-raspi2 - Linux kernel for Raspberry Pi 2
  o linux-aws-5.0 - Linux kernel for Amazon Web Services (AWS) systems
  o linux-gke-5.0 - Linux kernel for Google Container Engine (GKE) systems
  o linux-hwe - Linux hardware enablement (HWE) kernel
  o linux-oem-osp1 - Linux kernel for OEM processors
  o linux-oracle-5.0 - Linux kernel for Oracle Cloud systems


Jann Horn discovered that the OverlayFS and ShiftFS Drivers in the Linux kernel
did not properly handle reference counting during memory mapping operations
when used in conjunction with AUFS. A local attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.

It was discovered that a buffer overflow existed in the 802.11 Wi-Fi
configuration interface for the Linux kernel when handling beacon settings. A
local attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2019-16746)

It was discovered that there was a memory leak in the Advanced Buffer
Management functionality of the Netronome NFP4000/NFP6000 NIC Driver in the
Linux kernel during certain error scenarios. A local attacker could use this to
cause a denial of service (memory exhaustion). (CVE-2019-19076)

Update instructions

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

Ubuntu 19.04
    linux-image-5.0.0-1008-oracle - 5.0.0-1008.13
    linux-image-5.0.0-1022-aws - 5.0.0-1022.25
    linux-image-5.0.0-1023-kvm - 5.0.0-1023.25
    linux-image-5.0.0-1023-raspi2 - 5.0.0-1023.24
    linux-image-5.0.0-1026-gcp - 5.0.0-1026.27
    linux-image-5.0.0-37-generic - 5.0.0-37.40
    linux-image-5.0.0-37-generic-lpae - 5.0.0-37.40
    linux-image-5.0.0-37-lowlatency - 5.0.0-37.40
    linux-image-aws -
    linux-image-gcp -
    linux-image-generic -
    linux-image-generic-lpae -
    linux-image-gke -
    linux-image-kvm -
    linux-image-lowlatency -
    linux-image-oracle -
    linux-image-raspi2 -
    linux-image-virtual -
Ubuntu 18.04 LTS
    linux-image-5.0.0-1008-oracle - 5.0.0-1008.13~18.04.1
    linux-image-5.0.0-1022-aws - 5.0.0-1022.25~18.04.1
    linux-image-5.0.0-1026-gcp - 5.0.0-1026.27~18.04.1
    linux-image-5.0.0-1026-gke - 5.0.0-1026.27~18.04.2
    linux-image-5.0.0-1030-oem-osp1 - 5.0.0-1030.34
    linux-image-5.0.0-37-generic - 5.0.0-37.40~18.04.1
    linux-image-5.0.0-37-generic-lpae - 5.0.0-37.40~18.04.1
    linux-image-5.0.0-37-lowlatency - 5.0.0-37.40~18.04.1
    linux-image-aws-edge -
    linux-image-gcp -
    linux-image-generic-hwe-18.04 -
    linux-image-generic-lpae-hwe-18.04 -
    linux-image-gke-5.0 -
    linux-image-lowlatency-hwe-18.04 -
    linux-image-oem-osp1 -
    linux-image-oracle-edge -
    linux-image-snapdragon-hwe-18.04 -
    linux-image-virtual-hwe-18.04 -

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .

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.


  o CVE-2019-15794
  o CVE-2019-16746
  o CVE-2019-19076

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