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Vulnerability of Linux kernel: use after free via get_futex_key

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via get_futex_key() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable software: Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.
Severity of this announce: 2/4.
Creation date: 08/05/2020.
Références of this computer vulnerability: CERTFR-2020-AVI-642, CERTFR-2020-AVI-672, CERTFR-2020-AVI-678, CVE-2020-14381, openSUSE-SU-2020:1655-1, PROJ-ZERO-2015, SUSE-SU-2020:2904-1, SUSE-SU-2020:2905-1, SUSE-SU-2020:2906-1, SUSE-SU-2020:2907-1, SUSE-SU-2020:2999-1, SUSE-SU-2020:3014-1, VIGILANCE-VUL-32215.

Description of the vulnerability 

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

Our Vigil@nce team determined that the severity of this threat announce is medium.

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 computer weakness announce.

Solutions for this threat 

Linux kernel: version 5.4.28.
The version 5.4.28 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.113.
The version 4.19.113 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.175.
The version 4.14.175 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.218.
The version 4.9.218 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.218.
The version 4.4.218 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.16.83.
The version 3.16.83 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/linux-3.16.83.tar.xz

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

openSUSE Leap 15.1: new kernel packages (12/10/2020).
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.71.1

SUSE LE 12 SP5: new kernel packages (13/10/2020).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.41.1

SUSE LE 12 SP5: new kerne-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.19.1

SUSE LE 15 SP1: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.47.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.61.1

SUSE LE 15 SP1: new kernel-rt packages (23/10/2020).
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.36.1
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