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Vulnerability of Linux kernel: denial of service via fpregs_state_valid

Synthesis of the vulnerability 

An attacker can trigger a fatal error via fpregs_state_valid() of the Linux kernel, in order to trigger a denial of service.
Impacted systems: Linux, Ubuntu.
Severity of this alert: 1/4.
Creation date: 06/12/2019.
Références of this alert: CERTFR-2020-AVI-096, CVE-2019-19602, USN-4284-1, VIGILANCE-VUL-31085.

Description of the vulnerability 

An attacker can trigger a fatal error via fpregs_state_valid() of the Linux kernel, in order to trigger a denial of service.
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This security weakness impacts software or systems such as Linux, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 5.4.2.
The version 5.4.2 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.3.15.
The version 5.3.15 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

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

Ubuntu: new linux-image-5.3.0 packages (19/02/2020).
New packages are available:
  Ubuntu 19.10: linux-image-generic 5.3.0.40.34
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.3.0.40.97

Wind River Linux: version 10.17.41.20.
The version 10.17.41.20 is fixed:
  https://support2.windriver.com/

Wind River Linux: version 10.19.45.3.
The version 10.19.45.3 is fixed:
  https://support2.windriver.com/
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