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Vulnerability of Linux kernel: denial of service via Namespace Mountpoint Reference Counter Race

Synthesis of the vulnerability 

An attacker can trigger a fatal error via Namespace Mountpoint Reference Counter Race of the Linux kernel, in order to trigger a denial of service.
Vulnerable systems: Debian, Android OS, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 1/4.
Creation date: 04/05/2020.
Références of this weakness: CERTFR-2020-AVI-356, CERTFR-2020-AVI-368, CERTFR-2020-AVI-376, CERTFR-2020-AVI-547, CVE-2020-12114, DLA-2241-1, DLA-2241-2, DLA-2242-1, DSA-4698-1, DSA-4699-1, openSUSE-SU-2020:0801-1, SUSE-SU-2020:1599-1, SUSE-SU-2020:1663-1, SUSE-SU-2020:2156-1, SUSE-SU-2020:2478-1, SUSE-SU-2020:2487-1, USN-4387-1, USN-4388-1, USN-4389-1, USN-4390-1, USN-4391-1, USN-4392-1, VIGILANCE-VUL-32174.

Description of the vulnerability 

An attacker can trigger a fatal error via Namespace Mountpoint Reference Counter Race of the Linux kernel, in order to trigger a denial of service.
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This threat announce impacts software or systems such as Debian, Android OS, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this cybersecurity alert is low.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this security alert.

Solutions for this threat 

Linux kernel: version 4.19.119.
The version 4.19.119 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.19.119.tar.xz

Linux kernel: version 4.14.178.
The version 4.14.178 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.221.
The version 4.9.221 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.221.
The version 4.4.221 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.16.84.
The version 3.16.84 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: patch for Namespace Mountpoint Reference Counter Race.
A patch is indicated in information sources.

Debian 10: new linux packages.
New packages are available:
  Debian 10: linux 4.19.118-2+deb10u1

Debian 8: new linux-4.9 packages.
New packages are available:
  Debian 8: linux-4.9 4.9.210-1+deb9u1~deb8u1

Debian 8: new linux packages.
New packages are available:
  Debian 8: linux 3.16.84-1

Debian 9: new linux packages.
New packages are available:
  Debian 9: linux 4.9.210-1+deb9u1

Google Android/Pixel: patch for September 2020.
A patch is indicated in information sources.

openSUSE Leap 15.1: new kernel packages.
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.52.1

SUSE LE 12 SP4: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP4: kernel-rt 4.12.14-8.23.1

SUSE LE 12 SP5: new kernel-rt packages (03/09/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.13.1

SUSE LE 15: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.52.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.45.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.28.1

Ubuntu 18.04: new linux-gke-5.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gke-5.0 5.0.0.1042.27

Ubuntu 20.04: new linux-image-5.4.0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-generic 5.4.0.37.40

Ubuntu: new linux-image-3.13.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic 3.13.0.180.189
  Ubuntu 12.04 ESM: linux-image-generic-lts-trusty 3.13.0.180.166

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.106.94
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.106.111

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.184.190
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.184.161

Ubuntu: new linux-image-5.3.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.3.0.59.113
  Ubuntu 19.10: linux-image-generic 5.3.0.59.49

Wind River Linux: version 10.18.44.17.
The version 10.18.44.17 is fixed:
  https://support2.windriver.com/
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