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Vulnerability of Linux kernel: assertion error via llcp_sock_connect

Synthesis of the vulnerability 

An attacker can force an assertion error via llcp_sock_connect() of the Linux kernel, in order to trigger a denial of service.
Vulnerable systems: Fedora, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 1/4.
Creation date: 02/11/2020.
Références of this weakness: CERTFR-2021-AVI-278, CERTFR-2021-AVI-284, CERTFR-2021-AVI-302, CERTFR-2021-AVI-372, CVE-2020-25671, FEDORA-2021-1c170a7c7c, FEDORA-2021-21360476b6, openSUSE-SU-2021:0579-1, SUSE-SU-2021:1210-1, SUSE-SU-2021:1211-1, SUSE-SU-2021:1238-1, SUSE-SU-2021:1248-1, SUSE-SU-2021:1266-1, SUSE-SU-2021:1301-1, SUSE-SU-2021:1573-1, SUSE-SU-2021:1596-1, SUSE-SU-2021:1617-1, USN-4948-1, VIGILANCE-VUL-33752.

Description of the vulnerability 

An attacker can force an assertion error via llcp_sock_connect() of the Linux kernel, in order to trigger a denial of service.
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This vulnerability bulletin impacts software or systems such as Fedora, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 5.11.14.
The version 5.11.14 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.10.30.
The version 5.10.30 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.112.
The version 5.4.112 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.187.
The version 4.19.187 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.231.
The version 4.14.231 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.267.
The version 4.9.267 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.267.
The version 4.4.267 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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

Fedora 32-33: new kernel-headers packages.
New packages are available:
  Fedora 32: kernel-headers 5.11.14-100.fc32
  Fedora 33: kernel-headers 5.11.14-200.fc33

Fedora 32-33: new kernel-tools packages.
New packages are available:
  Fedora 32: kernel-tools 5.11.14-100.fc32
  Fedora 33: kernel-tools 5.11.14-200.fc33

openSUSE Leap 15.2: new kernel packages.
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.72.1

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.155.1

SUSE LE 12 SP4: new kernel packages.
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.74.1

SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.53.1

SUSE LE 12 SP5: new kernel packages (16/04/2021).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.66.2

SUSE LE 12 SP5: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.40.1

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.72.1

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.44.1

SUSE LE 15 SP2: new kernel packages.
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.61.1

SUSE LE 15 SP2: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP2: kernel-rt 5.3.18-33.1

Ubuntu: new linux-image-5.10.0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-5.10.0-1026-oem 5.10.0-1026.27, linux-image-oem-20.04b 5.10.0.1026.27
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