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Vulnerability of Linux kernel: denial of service via Iptables String Match

Synthesis of the vulnerability 

An attacker can trigger a fatal error via Iptables String Match of the Linux kernel, in order to trigger a denial of service.
Vulnerable systems: Debian, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 1/4.
Creation date: 12/01/2021.
Références of this weakness: 209823, CERTFR-2021-AVI-077, CERTFR-2021-AVI-111, CERTFR-2021-AVI-120, CERTFR-2021-AVI-138, CERTFR-2021-AVI-149, CVE-2021-20177, DLA-2557-1, DSA-4843-1, 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, USN-4750-1, VIGILANCE-VUL-34274.

Description of the vulnerability 

An attacker can trigger a fatal error via Iptables String Match of the Linux kernel, in order to trigger a denial of service.
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This threat alert impacts software or systems such as Debian, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer vulnerability bulletin is low.

The trust level is of type confirmed by the editor, with an origin of privileged shell.

An attacker with a expert ability can exploit this weakness note.

Solutions for this threat 

Linux kernel: patch for Iptables String Match.
A patch is indicated in information sources.

Debian 10: new linux packages.
New packages are available:
  Debian 10: linux 4.19.171-2

Debian 9: new linux-4.19 packages.
New packages are available:
  Debian 9: linux-4.19 4.19.171-2~deb9u1

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

Ubuntu 18/20: new linux-image-5.4.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.4.0.66.74~18.04.61
  Ubuntu 20.04 LTS: linux-image-generic 5.4.0.66.69
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