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Vulnerability of Linux kernel: privilege escalation via signal

Synthesis of the vulnerability 

An attacker can bypass restrictions on the kill system call of the Linux kernel, in order to escalate his privileges.
Impacted systems: Debian, Android OS, Linux, Slackware, Ubuntu.
Severity of this alert: 1/4.
Creation date: 13/05/2020.
Références of this alert: CERTFR-2020-AVI-356, CERTFR-2020-AVI-368, CVE-2020-12826, DLA-2241-1, DLA-2241-2, SSA:2020-163-01, USN-4391-1, VIGILANCE-VUL-32261.

Description of the vulnerability 

An attacker can bypass restrictions on the kill system call of the Linux kernel, in order to escalate his privileges.
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This threat note impacts software or systems such as Debian, Android OS, Linux, Slackware, Ubuntu.

Our Vigil@nce team determined that the severity of this cybersecurity note is low.

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 vulnerability note.

Solutions for this threat 

Linux kernel: version 5.6.5.
The version 5.6.5 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.9.220.
The version 4.9.220 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.220.
The version 4.4.220 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.16.85.
The version 3.16.85 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Debian 8: new linux packages.
New packages are available:
  Debian 8: linux 3.16.84-1

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

Slackware 14.2: new kernel packages.
New packages are available:
  Slackware 14.2: kernel 4.4.227-i586-1

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.184.190
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.184.161

Wind River Linux: version 10.18.44.17.
The version 10.18.44.17 is fixed:
  https://support2.windriver.com/
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Computer vulnerabilities tracking service 

Vigil@nce provides network vulnerability analysis. The Vigil@nce computer vulnerability tracking service alerts your teams of vulnerabilities or threats impacting your information system.