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Vulnerability of Linux kernel: SELinux validation bypass for netlink messages

Synthesis of the vulnerability 

An attacker can bypass SELinux restrictions on netlink messages by bundling them into a unique system call.
Vulnerable products: Debian, QRadar SIEM, Junos Space, Junos Space Network Management Platform, Linux, openSUSE Leap, Oracle Communications, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this weakness: 2/4.
Creation date: 27/05/2020.
Références of this bulletin: 6408856, CERTFR-2020-AVI-356, CERTFR-2020-AVI-368, CERTFR-2020-AVI-376, CERTFR-2020-AVI-421, CERTFR-2020-AVI-462, CERTFR-2020-AVI-489, CERTFR-2020-AVI-547, CERTFR-2020-AVI-612, CERTFR-2020-AVI-710, cpuapr2021, CVE-2020-10751, DLA-2241-1, DLA-2241-2, DLA-2242-1, DSA-4698-1, DSA-4699-1, JSA11174, JSA11176, openSUSE-SU-2020:0801-1, openSUSE-SU-2020:0935-1, openSUSE-SU-2021:0242-1, RHSA-2020:4060-01, RHSA-2020:4062-01, RHSA-2020:4431-01, RHSA-2020:4609-01, SSA:2020-163-01, SUSE-SU-2020:1599-1, SUSE-SU-2020:1663-1, SUSE-SU-2020:2027-1, SUSE-SU-2020:2105-1, SUSE-SU-2020:2134-1, SUSE-SU-2020:2152-1, SUSE-SU-2020:2156-1, SUSE-SU-2020:2478-1, SUSE-SU-2020:2487-1, USN-4389-1, USN-4390-1, USN-4391-1, USN-4412-1, USN-4413-1, VIGILANCE-VUL-32346.

Description of the vulnerability 

An attacker can bypass SELinux restrictions on netlink messages by bundling them into a unique system call.
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This weakness note impacts software or systems such as Debian, QRadar SIEM, Junos Space, Junos Space Network Management Platform, Linux, openSUSE Leap, Oracle Communications, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 5.6.11.
The version 5.6.11 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.6.11.tar.xz

Linux kernel: version 5.4.39.
The version 5.4.39 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.4.39.tar.xz

Linux kernel: version 4.19.121.
The version 4.19.121 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.19.121.tar.xz

Linux kernel: version 4.14.179.
The version 4.14.179 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.14.179.tar.xz

Linux kernel: version 4.9.222.
The version 4.9.222 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.9.222.tar.xz

Linux kernel: version 4.4.222.
The version 4.4.222 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.4.222.tar.xz

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

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

Debian 10: new linux packages.
New packages are available:
  Debian 10: linux 4.19.118-2+deb10u1

Debian 8: new linux-4.9 packages.
New packages are available:
  Debian 8: linux-4.9 4.9.210-1+deb9u1~deb8u1

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

Debian 9: new linux packages.
New packages are available:
  Debian 9: linux 4.9.210-1+deb9u1

IBM QRadar SIEM: solution for Components2.
The solution is indicated in information sources.

Junos Space: version 21.1R1.
The version 21.1R1 is fixed:
  https://support.juniper.net/support/downloads/
The version fixes more than 450 vulnerabilities, but only the 100 recent vulnerabilities were associated to this bulletin.

openSUSE Leap 15.1: new kernel packages.
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.52.1

openSUSE Leap 15.2: new kernel packages.
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.20.7.1

openSUSE Leap 15.2: new kernel-rt packages.
New packages are available:
  openSUSE Leap 15.2: kernel-rt 5.3.18-lp152.3.5.1

Oracle Communications: CPU of April 2021.
A Critical Patch Update is available:
  https://support.oracle.com/rs?type=doc&id=2766613.1
  https://support.oracle.com/rs?type=doc&id=2765939.1
  https://support.oracle.com/rs?type=doc&id=2765941.1
  https://support.oracle.com/rs?type=doc&id=2652618.1
  https://support.oracle.com/rs?type=doc&id=2765926.1
  https://support.oracle.com/rs?type=doc&id=2766616.1
  https://support.oracle.com/rs?type=doc&id=2765925.1
  https://support.oracle.com/rs?type=doc&id=2769144.1
  https://support.oracle.com/rs?type=doc&id=2766633.1
  https://support.oracle.com/rs?type=doc&id=2766634.1
  https://support.oracle.com/rs?type=doc&id=2739349.1
  https://support.oracle.com/rs?type=doc&id=2765938.1
  https://support.oracle.com/rs?type=doc&id=2766637.1

RHEL 7.8: new kernel packages.
New packages are available:
  RHEL 7.0-7.8: kernel 3.10.0-1160.el7

RHEL 7.8: new kernel-rt packages.
New packages are available:
  RHEL 7.0-7.8: kernel-rt 3.10.0-1160.rt56.1131.el7

RHEL 8: new kernel packages (04/11/2020).
New packages are available:
  RHEL 8.0-8.2: kernel 4.18.0-240.el8

RHEL 8: new kernel-rt packages (04/11/2020).
New packages are available:
  RHEL 8.0-8.2: kernel-rt 4.18.0-240.rt7.54.el8

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

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.138.1

SUSE LE 12 SP3: new kernel packages.
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.180-94.127.1

SUSE LE 12 SP4: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP4: kernel-rt 4.12.14-8.23.1

SUSE LE 12 SP5: new kernel-rt packages (03/09/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.13.1

SUSE LE 15: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.52.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.45.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.28.1

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.5.1

SUSE LE 15 SP2: new kernel packages.
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.9.1

Ubuntu 18.04: new linux-image-5.0.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gke-5.0 5.0.0.1043.28

Ubuntu 20.04: new linux-image-5.4.0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-generic 5.4.0.37.40

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.106.94
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.106.111

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

Ubuntu: new linux-image-5.3.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.3.0.62.115
  Ubuntu 19.10: linux-image-generic 5.3.0.62.52
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