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Vulnerability of Linux kernel: use after free via f_midi_set_alt

Synthesis of the vulnerability

An attacker can force the usage of a freed memory area via f_midi_set_alt() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Severity of this threat: 2/4.
Creation date: 27/08/2019.
Références of this weakness: CERTFR-2019-AVI-478, CVE-2018-20961, SSA:2019-238-01, USN-4145-1, VIGILANCE-VUL-30170.

Description of the vulnerability

An attacker can force the usage of a freed memory area via f_midi_set_alt() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This security threat impacts software or systems such as Android OS, Linux, Slackware, Ubuntu.

Our Vigil@nce team determined that the severity of this computer weakness note 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 alert.

Solutions for this threat

Linux kernel: version 4.16.4.
The version 4.16.4 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.36.
The version 4.14.36 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.96.
The version 4.9.96 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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

Google Android/Pixel: patch for December 2019.
A patch is indicated in information sources.

Slackware 14.2: new kernel packages.
New packages are available:
  Slackware 14.2: kernel 4.4.190-*-1

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.165.173
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