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Vulnerability of Linux kernel: use after free via ext4_put_super

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via ext4_put_super() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable systems: Linux, SUSE Linux Enterprise Desktop, SLES.
Severity of this threat: 2/4.
Creation date: 09/12/2019.
Références of this weakness: 1158819, 205433, CERTFR-2020-AVI-029, CVE-2019-19447, SUSE-SU-2020:0093-1, SUSE-SU-2020:0511-1, VIGILANCE-VUL-31094.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via ext4_put_super() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This security threat impacts software or systems such as Linux, SUSE Linux Enterprise Desktop, SLES.

Our Vigil@nce team determined that the severity of this computer weakness note is medium.

The trust level is of type confirmed by the editor, with an origin of physical access.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this computer threat alert.

Solutions for this threat 

Linux kernel: version 3.16.82.
The version 3.16.82 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: patch for ext4_put_super.
A patch is indicated in information sources.

SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.7.1

SUSE LE 15 SP1: new kernel-azure packages (28/02/2020).
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.27.1
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