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             AUSCERT External Security Bulletin Redistribution

               LSN-0066-1: Kernel Live Patch Security Notice
                                5 May 2020


        AusCERT Security Bulletin Summary

Product:           Linux Kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-8649 CVE-2020-8648 CVE-2020-8647

Reference:         ESB-2020.1476

Original Bulletin: 

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

LSN-0066-1: Kernel Live Patch Security Notice
1 May 2020

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

  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS
  o Ubuntu 14.04 ESM


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-azure - Linux kernel for Microsoft Azure Cloud systems
  o linux-oem - Linux kernel for OEM processors


It was discovered that the virtual terminal implementation in the Linux kernel
did not properly handle resize events. A local attacker could use this to
expose sensitive information. (CVE-2020-8647)

It was discovered that the virtual terminal implementation in the Linux kernel
contained a race condition. A local attacker could possibly use this to cause a
denial of service (system crash) or expose sensitive information.

It was discovered that the virtual terminal implementation in the Linux kernel
did not properly handle resize events. A local attacker could use this to
expose sensitive information. (CVE-2020-8649)

Update instructions

The problem can be corrected by updating your kernel livepatch to the following

Ubuntu 18.04 LTS
    aws - 66.1
    generic - 66.1
    lowlatency - 66.1
    oem - 66.1
Ubuntu 16.04 LTS
    aws - 66.1
    azure - 66.1
    generic - 66.1
    lowlatency - 66.1
Ubuntu 14.04 ESM
    generic - 66.1
    lowlatency - 66.1

Support Information

Kernels older than the levels listed below do not receive livepatch updates. If
you are running a kernel version earlier than the one listed below, please
upgrade your kernel as soon as possible.

Ubuntu 18.04 LTS
    linux - 4.15.0-69
    linux-aws - 4.15.0-1054
    linux-azure - 5.0.0-1025
    linux-gcp - 5.0.0-1025
    linux-oem - 4.15.0-1063
Ubuntu 16.04 LTS
    linux - 4.4.0-168
    linux-aws - 4.4.0-1098
    linux-azure - 4.15.0-1063
    linux-hwe - 4.15.0-69
Ubuntu 14.04 ESM
    linux-lts-xenial - 4.4.0-168


  o CVE-2020-8647
  o CVE-2020-8648
  o CVE-2020-8649

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