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Vulnerability of Linux kernel: information disclosure via romfs_dev_read

Synthesis of the vulnerability 

A local attacker can read a memory fragment via romfs_dev_read() of the Linux kernel, in order to obtain sensitive information.
Vulnerable software: Linux.
Severity of this announce: 1/4.
Creation date: 02/10/2020.
Références of this computer vulnerability: PROJ-ZERO-2077, VIGILANCE-VUL-33475.

Description of the vulnerability 

A local attacker can read a memory fragment via romfs_dev_read() of the Linux kernel, in order to obtain sensitive information.
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This computer vulnerability alert impacts software or systems such as Linux.

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

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 security vulnerability.

Solutions for this threat 

Linux kernel: version 5.8.4.
The version 5.8.4 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.7.18.
The version 5.7.18 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.61.
The version 5.4.61 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.142.
The version 4.19.142 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.195.
The version 4.14.195 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.234.
The version 4.9.234 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.234.
The version 4.4.234 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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