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Vulnerability of Linux kernel: out-of-bounds memory reading via __xfrm_policy_unlink

Synthesis of the vulnerability 

An attacker can force a read at an invalid address via __xfrm_policy_unlink() of the Linux kernel, in order to trigger a denial of service, or to obtain sensitive information.
Vulnerable software: Debian, Android OS, Linux, openSUSE Leap, SIMATIC, SUSE Linux Enterprise Desktop, SLES.
Severity of this announce: 2/4.
Creation date: 28/08/2019.
Références of this computer vulnerability: CERTFR-2019-AVI-455, CERTFR-2019-AVI-502, CERTFR-2019-AVI-503, CERTFR-2019-AVI-530, CERTFR-2019-AVI-561, CERTFR-2019-AVI-575, CVE-2019-15666, DLA-1919-1, DLA-1919-2, openSUSE-SU-2019:2173-1, openSUSE-SU-2019:2181-1, SSB-439005, SUSE-SU-2019:2412-1, SUSE-SU-2019:2424-1, SUSE-SU-2019:2648-1, SUSE-SU-2019:2651-1, SUSE-SU-2019:2658-1, SUSE-SU-2019:2738-1, SUSE-SU-2019:2949-1, SUSE-SU-2019:2984-1, VIGILANCE-VUL-30175.

Description of the vulnerability 

An attacker can force a read at an invalid address via __xfrm_policy_unlink() of the Linux kernel, in order to trigger a denial of service, or to obtain sensitive information.
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This computer vulnerability alert impacts software or systems such as Debian, Android OS, Linux, openSUSE Leap, SIMATIC, SUSE Linux Enterprise Desktop, SLES.

Our Vigil@nce team determined that the severity of this computer threat 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 vulnerability.

Solutions for this threat 

Linux kernel: version 5.0.19.
The version 5.0.19 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.46.
The version 4.19.46 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.122.
The version 4.14.122 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.179.
The version 4.9.179 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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

Debian 8: new linux-4.9 packages.
New packages are available:
  Debian 8: linux-4.9 4.9.189-3~deb8u1

Google Android/Pixel: patch for March 2020.
A patch is indicated in information sources.

openSUSE Leap 15: new kernel packages.
New packages are available:
  openSUSE Leap 15.0: kernel 4.12.14-lp150.12.73.1
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.16.1

SIMATIC S7-1500 CPU 1518: workaround for GNU/Linux Vulnerabilities.
A workaround is indicated in the information source.

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.125.1

SUSE LE 12 SP3: new kernel packages (13/11/2019).
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.180-94.107.1

SUSE LE 12 SP4: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP4: kernel-azure 4.12.14-6.26.1

SUSE LE 12 SP4: new kernel-default packages.
New packages are available:
  SUSE LE 12 SP4: kernel-default 4.12.14-95.32.1

SUSE LE 15: new kernel-azure packages.
New packages are available:
  SUSE LE 15 RTM: kernel-azure 4.12.14-5.41.1
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.16.1

SUSE LE 15 SP1: new kernel-default packages.
New packages are available:
  SUSE LE 15 SP1: kernel-default 4.12.14-197.18.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.11.1
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