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Vulnerability of Linux kernel: privilege escalation via dev_map_init_map

Synthesis of the vulnerability 

An attacker can bypass restrictions via dev_map_init_map() of the Linux kernel, in order to escalate his privileges.
Vulnerable software: Linux, Ubuntu.
Severity of this announce: 1/4.
Creation date: 10/03/2021.
Références of this computer vulnerability: CERTFR-2021-AVI-265, CVE-2021-20268, RHBUG-1923816, USN-4910-1, VIGILANCE-VUL-34801, ZDI-21-101.

Description of the vulnerability 

An attacker can bypass restrictions via dev_map_init_map() of the Linux kernel, in order to escalate his privileges.
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This weakness announce impacts software or systems such as Linux, Ubuntu.

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

Solutions for this threat 

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

Ubuntu: new linux-image-5.8.0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-generic-hwe-20.04 5.8.0.49.55~20.04.33
  Ubuntu 20.10: linux-image-generic 5.8.0.49.54
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