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             AUSCERT External Security Bulletin Redistribution

                 USN-4411-1: Linux kernel vulnerabilities
                               15 July 2020


        AusCERT Security Bulletin Summary

Product:           kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service      -- Remote/Unauthenticated
                   Access Privileged Data -- Existing Account      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-13143 CVE-2020-12770 CVE-2020-12768
                   CVE-2020-10732 CVE-2020-10711 

Reference:         ESB-2020.2006

Original Bulletin: 

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

USN-4411-1: Linux kernel vulnerabilities
06 July 2020

linux, linux-aws, inux-azure, linux-gcp, linux-kvm, linux-oracle, linux-raspi, linux-riscv vulnerabilities

  o Ubuntu 20.04 LTS


  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-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-raspi - Linux kernel for Raspberry Pi (V8) systems
  o linux-riscv - Linux kernel for RISC-V systems


It was discovered that the elf handling code in the Linux kernel did not
initialize memory before using it in certain situations. A local attacker
could use this to possibly expose sensitive information (kernel memory).

Matthew Sheets discovered that the SELinux network label handling
implementation in the Linux kernel could be coerced into de-referencing a
NULL pointer. A remote attacker could use this to cause a denial of service
(system crash). (CVE-2020-10711)

It was discovered that the SCSI generic (sg) driver in the Linux kernel did
not properly handle certain error conditions correctly. A local privileged
attacker could use this to cause a denial of service (system crash).

It was discovered that the USB Gadget device driver in the Linux kernel did
not validate arguments passed from configfs in some situations. A local
attacker could possibly use this to cause a denial of service (system
crash) or possibly expose sensitive information. (CVE-2020-13143)

It was discovered that the KVM implementation in the Linux kernel did not
properly deallocate memory on initialization for some processors. A local
attacker could possibly use this to cause a denial of service.

Update instructions

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

Ubuntu 20.04

  o linux-image-5.4.0-1013-raspi - 5.4.0-1013.13
  o linux-image-5.4.0-1018-aws - 5.4.0-1018.18
  o linux-image-5.4.0-1019-gcp - 5.4.0-1019.19
  o linux-image-5.4.0-1019-oracle - 5.4.0-1019.19
  o linux-image-5.4.0-1020-azure - 5.4.0-1020.20
  o linux-image-5.4.0-28-generic - 5.4.0-28.32
  o linux-image-5.4.0-40-generic - 5.4.0-40.44
  o linux-image-5.4.0-40-generic-lpae - 5.4.0-40.44
  o linux-image-5.4.0-40-lowlatency - 5.4.0-40.44
  o linux-image-aws -
  o linux-image-azure -
  o linux-image-gcp -
  o linux-image-generic -
  o linux-image-generic-lpae -
  o linux-image-gke -
  o linux-image-kvm -
  o linux-image-lowlatency -
  o linux-image-oem -
  o linux-image-oem-osp1 -
  o linux-image-oracle -
  o linux-image-raspi -
  o linux-image-raspi2 -
  o linux-image-virtual -

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-2020-13143
  o CVE-2020-12768
  o CVE-2020-10711
  o CVE-2020-10732
  o CVE-2020-12770

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