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Vulnerability of Xen: information disclosure via ARM ERET Instruction Speculate

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via ARM ERET Instruction Speculate of Xen, in order to obtain sensitive information.
Impacted software: Fedora, Xen.
Severity of this computer vulnerability: 1/4.
Creation date: 14/01/2020.
Références of this announce: CERTFR-2020-AVI-031, FEDORA-2020-2d9a75fadb, VIGILANCE-VUL-31318, XSA-312.

Description of the vulnerability 

An attacker can bypass access restrictions to data via ARM ERET Instruction Speculate of Xen, in order to obtain sensitive information.
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This computer vulnerability announce impacts software or systems such as Fedora, Xen.

Our Vigil@nce team determined that the severity of this cybersecurity 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 alert.

Solutions for this threat 

Xen: version 4.11.4.
The version 4.11.4 is fixed:
  https://xenbits.xenproject.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.11

Xen: patch for ARM ERET Instruction Speculate.
A patch is indicated in information sources.

Fedora 30: new xen packages.
New packages are available:
  Fedora 30: xen 4.11.3-3.fc30
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