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Vulnerability of Linux kernel: use after free via sunkbd_reinit

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via sunkbd_reinit() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Impacted products: Debian, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this bulletin: 2/4.
Creation date: 05/11/2020.
Références of this threat: CERTFR-2020-AVI-769, CERTFR-2020-AVI-794, CERTFR-2020-AVI-811, CERTFR-2020-AVI-834, CERTFR-2020-AVI-837, CERTFR-2021-AVI-064, CERTFR-2021-AVI-111, CERTFR-2021-AVI-120, CERTFR-2021-AVI-125, CERTFR-2021-AVI-149, CVE-2020-25669, DLA-2483-1, DLA-2494-1, openSUSE-SU-2020:2034-1, openSUSE-SU-2020:2161-1, openSUSE-SU-2020:2260-1, openSUSE-SU-2021:0242-1, SUSE-SU-2020:3484-1, SUSE-SU-2020:3713-1, SUSE-SU-2020:3715-1, SUSE-SU-2020:3717-1, SUSE-SU-2020:3718-1, SUSE-SU-2020:3748-1, SUSE-SU-2020:3764-1, SUSE-SU-2020:3766-1, SUSE-SU-2020:3798-1, 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-4708-1, USN-4709-1, USN-4749-1, USN-4750-1, USN-4751-1, VIGILANCE-VUL-33825.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via sunkbd_reinit() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This computer weakness note 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 security bulletin is medium.

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

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this weakness announce.

Solutions for this threat 

Linux kernel: version 5.9.10.
The version 5.9.10 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.79.
The version 5.4.79 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.159.
The version 4.19.159 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.208.
The version 4.14.208 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.245.
The version 4.9.245 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.245.
The version 4.4.245 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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

Debian 9: new linux-4.19 packages (10/12/2020).
New packages are available:
  Debian 9: linux-4.19 4.19.160-2~deb9u1

Debian 9: new linux packages.
New packages are available:
  Debian 9: linux 4.9.246-2

openSUSE Leap 15.1: new kernel packages.
New packages are available:
  openSUSE Leap 15.1: kernel-default 4.12.14-lp151.28.83.1

openSUSE Leap 15.2: new kernel packages (07/12/2020).
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.54.1

openSUSE Leap 15.2: new kernel packages (15/12/2020).
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.57.1.lp152.8.17.1

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

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 (09/12/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.38.1

SUSE LE 12 SP5: new kernel packages (09/12/2020).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.54.1

SUSE LE 12 SP5: new kernel-rt packages (14/12/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.25.1

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 (24/11/2020).
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.52.1

SUSE LE 15 SP1: new kernel packages (09/12/2020).
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.75.1

SUSE LE 15 SP1: new kernel-rt packages (15/12/2020).
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.44.2

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.29.1

SUSE LE 15 SP2: new kernel packages (11/12/2020).
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.43.2

SUSE LE 15 SP2: new kernel-rt packages (14/12/2020).
New packages are available:
  SUSE LE 15 SP2: kernel-rt 5.3.18-19.1

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 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: 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

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.201.176
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.201.207
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