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14 August 2019

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             AUSCERT External Security Bulletin Redistribution

                 USN-4093-1: Linux kernel vulnerabilities
                              14 August 2019


        AusCERT Security Bulletin Summary

Product:           kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Root Compromise        -- Existing Account
                   Access Privileged Data -- Existing Account
                   Denial of Service      -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-13272 CVE-2019-13233 CVE-2019-12984
                   CVE-2019-12614 CVE-2019-10126 CVE-2019-3846

Reference:         ASB-2019.0229

Original Bulletin: 

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

USN-4093-1: Linux kernel vulnerabilities
13 August 2019

linux, linux-hwe, linux-azure, linux-gcp, linux-kvm, linux-raspi2, linux-snapdragon 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-azure - Linux kernel for Microsoft Azure Cloud systems
  o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  o linux-kvm - Linux kernel for cloud environments
  o linux-raspi2 - Linux kernel for Raspberry Pi 2
  o linux-snapdragon - Linux kernel for Snapdragon processors
  o linux-hwe - Linux hardware enablement (HWE) kernel


It was discovered that a heap buffer overflow existed in the Marvell Wireless
LAN device driver for the Linux kernel. An attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.

Andrei Vlad Lutas and Dan Lutas discovered that some x86 processors incorrectly
handle SWAPGS instructions during speculative execution. A local attacker could
use this to expose sensitive information (kernel memory). (CVE-2019-1125)

It was discovered that the PowerPC dlpar implementation in the Linux kernel did
not properly check for allocation errors in some situations. A local attacker
could possibly use this to cause a denial of service (system crash).

It was discovered that a NULL pointer dereference vulnerability existed in the
Near-field communication (NFC) implementation in the Linux kernel. A local
attacker could use this to cause a denial of service (system crash).

Jann Horn discovered a use-after-free vulnerability in the Linux kernel when
accessing LDT entries in some situations. A local attacker could use this to
cause a denial of service (system crash) or possibly execute arbitrary code.

Jann Horn discovered that the ptrace implementation in the Linux kernel did not
properly record credentials in some situations. A local attacker could use this
to cause a denial of service (system crash) or possibly gain administrative
privileges. (CVE-2019-13272)

It was discovered that the Marvell Wireless LAN device driver in the Linux
kernel did not properly validate the BSS descriptor. A local attacker could
possibly use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2019-3846)

Update instructions

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

Ubuntu 19.04
    linux-image-5.0.0-1013-gcp - 5.0.0-1013.13
    linux-image-5.0.0-1013-kvm - 5.0.0-1013.14
    linux-image-5.0.0-1014-azure - 5.0.0-1014.14
    linux-image-5.0.0-1014-raspi2 - 5.0.0-1014.14
    linux-image-5.0.0-1018-snapdragon - 5.0.0-1018.19
    linux-image-5.0.0-25-generic - 5.0.0-25.26
    linux-image-5.0.0-25-generic-lpae - 5.0.0-25.26
    linux-image-5.0.0-25-lowlatency - 5.0.0-25.26
    linux-image-azure -
    linux-image-gcp -
    linux-image-generic -
    linux-image-generic-lpae -
    linux-image-gke -
    linux-image-kvm -
    linux-image-lowlatency -
    linux-image-raspi2 -
    linux-image-snapdragon -
    linux-image-virtual -
Ubuntu 18.04 LTS
    linux-image-5.0.0-1014-azure - 5.0.0-1014.14~18.04.1
    linux-image-5.0.0-25-generic - 5.0.0-25.26~18.04.1
    linux-image-5.0.0-25-generic-lpae - 5.0.0-25.26~18.04.1
    linux-image-5.0.0-25-lowlatency - 5.0.0-25.26~18.04.1
    linux-image-azure -
    linux-image-generic-hwe-18.04 -
    linux-image-generic-lpae-hwe-18.04 -
    linux-image-lowlatency-hwe-18.04 -
    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-2019-10126
  o CVE-2019-1125
  o CVE-2019-12614
  o CVE-2019-12984
  o CVE-2019-13233
  o CVE-2019-13272
  o CVE-2019-3846

- --------------------------END INCLUDED TEXT--------------------

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