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Vulnerability of Linux kernel: use after free via n_tty_receive_buf_common

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via n_tty_receive_buf_common() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable software: Linux, openSUSE Leap, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this announce: 2/4.
Creation date: 06/02/2020.
Références of this computer vulnerability: 206361, CERTFR-2020-AVI-119, CERTFR-2020-AVI-124, CERTFR-2020-AVI-130, CERTFR-2020-AVI-252, CERTFR-2020-AVI-260, CERTFR-2020-AVI-318, CVE-2020-8648, openSUSE-SU-2020:0336-1, SSA:2020-086-01, 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-2020:0649-1, SUSE-SU-2020:0667-1, SUSE-SU-2020:0688-1, SUSE-SU-2020:0836-1, SUSE-SU-2020:1255-1, SUSE-SU-2020:14354-1, USN-4342-1, USN-4344-1, USN-4345-1, USN-4346-1, VIGILANCE-VUL-31537.

Description of the vulnerability 

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

Our Vigil@nce team determined that the severity of this security bulletin 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 weakness announce.

Solutions for this threat 

Linux kernel: version 5.5.9.
The version 5.5.9 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.5.9.tar.xz

Linux kernel: version 5.4.25.
The version 5.4.25 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.4.25.tar.xz

Linux kernel: version 4.19.109.
The version 4.19.109 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.19.109.tar.xz

Linux kernel: version 4.14.173.
The version 4.14.173 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.14.173.tar.xz

Linux kernel: version 4.9.216.
The version 4.9.216 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.9.216.tar.xz

Linux kernel: version 4.4.216.
The version 4.4.216 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.4.216.tar.xz

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 n_tty_receive_buf_common.
A patch is indicated in information sources.

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

Slackware 14.2: new kernel packages (27/03/2020).
New packages are available:
  Slackware 14.2: kernel 4.4.217-i586-1

SUSE LE 11 SP4: new kernel packages.
New packages are available:
  SUSE LE 11 SP4: kernel 3.0.101-108.111.1

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel-default 4.4.121-92.129.1

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 4.12.14-8.15.1

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 4.12.14-10.5.1

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 (01/04/2020).
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.37.1

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

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.20.1

Ubuntu 18.04 LTS: new linux-image-5.0.0 packages.
New packages are available, as indicated in information sources.

Ubuntu: new linux-image-4.15.0 packages (29/04/2020).
New packages are available, as indicated in information sources.

Ubuntu: new linux-image-4.4.0 packages.
New packages are available, as indicated in information sources.

Ubuntu: new linux-image-5.3.0 packages (29/04/2020).
New packages are available, as indicated in information sources.

Wind River Linux: version 10.17.41.20.
The version 10.17.41.20 is fixed:
  https://support2.windriver.com/

Wind River Linux: version 10.18.44.15.
The version 10.18.44.15 is fixed:
  https://support2.windriver.com/

Wind River Linux: version 10.19.45.7.
The version 10.19.45.7 is fixed:
  https://support2.windriver.com/
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