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Vulnerability of Linux kernel: use after free via tun_get_user

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via tun_get_user() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable products: Android OS, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.
Severity of this weakness: 2/4.
Creation date: 08/02/2021.
Références of this bulletin: 1180812, CERTFR-2021-AVI-111, CERTFR-2021-AVI-120, CERTFR-2021-AVI-138, CVE-2021-0342, openSUSE-SU-2021:0241-1, SUSE-SU-2021:0347-1, SUSE-SU-2021:0348-1, SUSE-SU-2021:0353-1, SUSE-SU-2021:0354-1, SUSE-SU-2021:0427-1, SUSE-SU-2021:0433-1, SUSE-SU-2021:0532-1, VIGILANCE-VUL-34506.

Description of the vulnerability 

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

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

Solutions for this threat 

Linux kernel: version 5.7.3.
The version 5.7.3 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.6.19.
The version 5.6.19 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.47.
The version 5.4.47 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

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

Google Android/Pixel: patch for January 2021.
A patch is indicated in information sources.

openSUSE Leap 15.2: new kernel packages.
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.63.1

SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.44.1

SUSE LE 12 SP5: new kernel packages.
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.60.1

SUSE LE 12 SP5: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.31.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.83.1

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.35.2

SUSE LE 15 SP2: new kernel packages (09/02/2021).
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.49.3

SUSE LE 15 SP2: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP2: kernel-rt 5.3.18-25.1
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