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Vulnerability of Linux kernel: use after free via TIOCSPGRP

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via TIOCSPGRP of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable systems: Debian, Fedora, Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 2/4.
Creation date: 10/12/2020.
Références of this weakness: CERTFR-2021-AVI-021, CERTFR-2021-AVI-035, CERTFR-2021-AVI-077, CERTFR-2021-AVI-078, CERTFR-2021-AVI-111, CERTFR-2021-AVI-120, CERTFR-2021-AVI-122, CERTFR-2021-AVI-125, CERTFR-2021-AVI-149, CVE-2020-29661, DLA-2557-1, DSA-4843-1, FEDORA-2020-b732958765, FEDORA-2020-bc0cc81a7a, openSUSE-SU-2021:0075-1, openSUSE-SU-2021:0242-1, RHSA-2021:0354-01, RHSA-2021:0537-01, RHSA-2021:0558-01, SUSE-SU-2021:0094-1, SUSE-SU-2021:0095-1, SUSE-SU-2021:0096-1, SUSE-SU-2021:0097-1, SUSE-SU-2021:0098-1, SUSE-SU-2021:0108-1, SUSE-SU-2021:0117-1, SUSE-SU-2021:0118-1, SUSE-SU-2021:0133-1, SUSE-SU-2021:0434-1, SUSE-SU-2021:0437-1, SUSE-SU-2021:0438-1, SUSE-SU-2021:0452-1, SUSE-SU-2021:14630-1, USN-4748-1, USN-4749-1, USN-4750-1, USN-4751-1, USN-4752-1, VIGILANCE-VUL-34082.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via TIOCSPGRP of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This security announce impacts software or systems such as Debian, Fedora, Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 5.9.14.
The version 5.9.14 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.83.
The version 5.4.83 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.163.
The version 4.19.163 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.212.
The version 4.14.212 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.248.
The version 4.4.248 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.248.
The version 4.9.248 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for TIOCSPGRP.
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

Fedora 32-33: new kernel packages.
New packages are available:
  Fedora 32: kernel 5.9.14-100.fc32
  Fedora 33: kernel 5.9.14-200.fc33

openSUSE Leap 15.1: new kernel packages (18/01/2021).
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.91.1

openSUSE Leap 15.2: new kernel packages (15/01/2021).
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.60.1

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

RHEL 7: new kernel-alt packages.
New packages are available:
  RHEL 7.0-7.9: kernel-alt 4.14.0-115.35.1.el7a

RHEL 8.3: new kernel packages.
New packages are available:
  RHEL 8.3: kernel 4.18.0-240.15.1.el8_3

RHEL 8.3: new kernel-rt packages.
New packages are available:
  RHEL 8.3: kernel-rt 4.18.0-240.15.1.rt7.69.el8_3

SUSE LE 11 SP4: new kernel packages.
New packages are available:
  SUSE LE 11 SP4: kernel 3.0.101-108.120.1

SUSE LE 12 SP2: new kernel packages (11/02/2021).
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.149.1

SUSE LE 12 SP3: new kernel packages (15/02/2021).
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.180-94.138.1

SUSE LE 12 SP4: new kernel packages.
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.68.1

SUSE LE 12 SP5: new kernel-azure packages (13/01/2021).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.41.1

SUSE LE 12 SP5: new kernel packages (15/01/2021).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.57.1

SUSE LE 12 SP5: new kernel-rt packages (13/01/2021).
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.28.3

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.66.1

SUSE LE 15 SP1: new kernel-azure packages (13/01/2021).
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.58.1

SUSE LE 15 SP1: new kernel packages (14/01/2021).
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.78.1

SUSE LE 15 SP1: new kernel-rt packages (13/01/2021).
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.47.1

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.32.1

SUSE LE 15 SP2: new kernel packages (14/01/2021).
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.46.1

SUSE LE 15 SP2: new kernel-rt packages (13/01/2021).
New packages are available:
  SUSE LE 15 SP2: kernel-rt 5.3.18-22.1

Ubuntu 14/16/18: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1108.81
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.136.132
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.136.123

Ubuntu 14/16: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.203.177
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.203.209

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

Ubuntu 20.04: new linux-image-5.6.0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-oem-20.04 5.6.0.1048.44

Ubuntu 20: new linux-image-5.8.0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-generic-hwe-20.04 5.8.0.44.50~20.04.30
  Ubuntu 20.10: linux-image-generic 5.8.0.44.49
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