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Vulnerability of Linux kernel: use after free via rwsem_down_write_slowpath

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via rwsem_down_write_slowpath() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable products: Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.
Severity of this weakness: 2/4.
Creation date: 28/11/2019.
Références of this bulletin: CERTFR-2020-AVI-119, CERTFR-2020-AVI-124, CERTFR-2020-AVI-130, CERTFR-2020-AVI-148, CVE-2019-19318, openSUSE-SU-2020:0336-1, SUSE-SU-2020:0511-1, SUSE-SU-2020:0558-1, SUSE-SU-2020:0559-1, SUSE-SU-2020:0560-1, SUSE-SU-2020:0580-1, SUSE-SU-2020:0599-1, SUSE-SU-2020:0605-1, VIGILANCE-VUL-31020.

Description of the vulnerability 

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

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

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

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 vulnerability.

Solutions for this threat 

openSUSE Leap 15.1: new kernel packages (13/03/2020).
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.40.1

SUSE LE 12 SP4: new kernel-azure packages (03/03/2020).
New packages are available:
  SUSE LE 12 SP4: kernel-azure 4.12.14-6.37.1

SUSE LE 12 SP4: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP4: kernel-rt 4.12.14-8.12.1

SUSE LE 12 SP5: new kernel-azure packages (03/03/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.10.1

SUSE LE 12 SP5: new kernel packages (04/03/2020).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.17.1

SUSE LE 12 SP5: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-6.3.1

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

SUSE LE 15 SP1: new kernel packages (03/03/2020).
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.34.1
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