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             AUSCERT External Security Bulletin Redistribution

                  USN-4486-1: Linux kernel vulnerability
                             2 September 2020


        AusCERT Security Bulletin Summary

Product:           kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-10323  

Reference:         ESB-2018.3020

Original Bulletin: 

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

USN-4486-1: Linux kernel vulnerability
02 September 2020

The Linux kernel could be made to crash if it mounted a malicious XFS
file system.

  o Ubuntu 16.04 LTS
  o Ubuntu 14.04 ESM


  o linux - Linux kernel
  o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  o linux-kvm - Linux kernel for cloud environments
  o linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty
  o linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
  o linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors


Wen Xu discovered that the XFS filesystem implementation in the Linux
kernel did not properly validate meta-data information. An attacker could
use this to construct a malicious xfs image that, when mounted, could cause
a denial of service (system crash).

Update instructions

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

Ubuntu 16.04

  o linux-image-4.4.0-1079-kvm - 4.4.0-1079.86
  o linux-image-4.4.0-1113-aws - 4.4.0-1113.126
  o linux-image-4.4.0-1138-raspi2 - 4.4.0-1138.147
  o linux-image-4.4.0-1142-snapdragon - 4.4.0-1142.151
  o linux-image-4.4.0-189-generic - 4.4.0-189.219
  o linux-image-4.4.0-189-generic-lpae - 4.4.0-189.219
  o linux-image-4.4.0-189-lowlatency - 4.4.0-189.219
  o linux-image-4.4.0-189-powerpc-e500mc - 4.4.0-189.219
  o linux-image-4.4.0-189-powerpc-smp - 4.4.0-189.219
  o linux-image-4.4.0-189-powerpc64-emb - 4.4.0-189.219
  o linux-image-4.4.0-189-powerpc64-smp - 4.4.0-189.219
  o linux-image-aws -
  o linux-image-generic -
  o linux-image-generic-lpae -
  o linux-image-kvm -
  o linux-image-lowlatency -
  o linux-image-powerpc-e500mc -
  o linux-image-powerpc-smp -
  o linux-image-powerpc64-emb -
  o linux-image-powerpc64-smp -
  o linux-image-raspi2 -
  o linux-image-snapdragon -
  o linux-image-virtual -

Ubuntu 14.04

  o linux-image-4.4.0-1077-aws - 4.4.0-1077.81
  o linux-image-4.4.0-189-generic - 4.4.0-189.219~14.04.1
  o linux-image-4.4.0-189-generic-lpae - 4.4.0-189.219~14.04.1
  o linux-image-4.4.0-189-lowlatency - 4.4.0-189.219~14.04.1
  o linux-image-4.4.0-189-powerpc-e500mc - 4.4.0-189.219~14.04.1
  o linux-image-4.4.0-189-powerpc-smp - 4.4.0-189.219~14.04.1
  o linux-image-4.4.0-189-powerpc64-emb - 4.4.0-189.219~14.04.1
  o linux-image-4.4.0-189-powerpc64-smp - 4.4.0-189.219~14.04.1
  o linux-image-aws -
  o linux-image-generic-lpae-lts-xenial -
  o linux-image-generic-lts-xenial -
  o linux-image-lowlatency-lts-xenial -
  o linux-image-powerpc-e500mc-lts-xenial -
  o linux-image-powerpc-smp-lts-xenial -
  o linux-image-powerpc64-emb-lts-xenial -
  o linux-image-powerpc64-smp-lts-xenial -
  o linux-image-virtual-lts-xenial -

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-2018-10323

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

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