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Vulnerability of Linux kernel: privilege escalation via User Namespace map_write

Synthesis of the vulnerability 

An attacker can bypass restrictions via User Namespace map_write() of the Linux kernel, in order to escalate his privileges.
Vulnerable software: Linux, Ubuntu.
Severity of this announce: 2/4.
Creation date: 14/11/2018.
Références of this computer vulnerability: 1712, 1798863, CERTFR-2018-AVI-581, CERTFR-2018-AVI-583, CVE-2018-18955, USN-3832-1, USN-3833-1, USN-3835-1, USN-3836-1, USN-3836-2, VIGILANCE-VUL-27781.

Description of the vulnerability 

An attacker can bypass restrictions via User Namespace map_write() of the Linux kernel, in order to escalate his privileges.
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This vulnerability note impacts software or systems such as Linux, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 4.19.2.
The version 4.19.2 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.18.19.
The version 4.18.19 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for User Namespace map_write.
A patch is indicated in information sources.

Ubuntu 18.04: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.42.63
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.42.44

Ubuntu 18.04: new linux-image-aws packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-aws 4.15.0.1029.29

Ubuntu 18.10: new linux-image-4.18.0 packages.
New packages are available:
  Ubuntu 18.10: linux-image-generic 4.18.0.12.13

Ubuntu 18.10: new linux-image-aws packages.
New packages are available:
  Ubuntu 18.10: linux-image-aws 4.18.0.1006.6
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