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Vulnerability of Linux kernel: buffer overflow via dm-ioctl.c

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via dm-ioctl.c of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable software: Linux, Ubuntu.
Severity of this announce: 1/4.
Creation date: 07/05/2021.
Références of this computer vulnerability: CERTFR-2021-AVI-372, CERTFR-2021-AVI-432, CERTFR-2021-AVI-436, CVE-2021-31916, USN-4948-1, USN-4979-1, USN-4982-1, USN-4984-1, VIGILANCE-VUL-35275.

Description of the vulnerability 

An attacker can trigger a buffer overflow via dm-ioctl.c of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This computer vulnerability note impacts software or systems such as Linux, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 4.4.269.
The version 4.4.269 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 5.12.
The version 5.12 is fixed:
  https://www.kernel.org/

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.144.131
  Ubuntu 16.04 ESM: linux-image-generic-hwe-16.04 4.15.0.144.140
  Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1115.88

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

Ubuntu: new linux-image-5.4.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.4.0.74.83~18.04.67
  Ubuntu 20.04 LTS: linux-image-generic 5.4.0.74.77

Ubuntu: new linux-image-5.8.0 packages.
New packages are available:
  Ubuntu 20.10: linux-image-generic 5.8.0.55.60
  Ubuntu 20.04 LTS: linux-image-generic-hwe-20.04 5.8.0.55.62~20.04.39
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