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Vulnerability of Linux kernel: information disclosure via setsockopt

Synthesis of the vulnerability 

A local attacker can read a memory fragment via setsockopt() of the Linux kernel, in order to obtain sensitive information.
Vulnerable products: Linux, Ubuntu.
Severity of this weakness: 1/4.
Creation date: 29/01/2021.
Références of this bulletin: CERTFR-2021-AVI-200, CVE-2021-20239, USN-4878-1, VIGILANCE-VUL-34434, ZDI-21-100.

Description of the vulnerability 

A local attacker can read a memory fragment via setsockopt() of the Linux kernel, in order to obtain sensitive information.
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This security announce impacts software or systems such as Linux, Ubuntu.

Our Vigil@nce team determined that the severity of this threat is low.

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 5.4.92.
The version 5.4.92 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

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

Ubuntu: new linux-image-5.4.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.4.0.67.75~18.04.62
  Ubuntu 20.04 LTS: linux-image-generic 5.4.0.67.70
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