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Vulnerability of Linux kernel: information disclosure via KVM Missing TLB Flushes

Synthesis of the vulnerability 

A local attacker, inside a guest system, can read a memory fragment via KVM Missing TLB Flushes of the Linux kernel, in order to obtain sensitive information on the host system.
Impacted products: Fedora, Linux.
Severity of this bulletin: 1/4.
Creation date: 31/01/2020.
Références of this threat: CVE-2019-3016, FEDORA-2020-2a5cdd665c, FEDORA-2020-f884f9dd7d, VIGILANCE-VUL-31479.

Description of the vulnerability 

A local attacker, inside a guest system, can read a memory fragment via KVM Missing TLB Flushes of the Linux kernel, in order to obtain sensitive information on the host system.
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This vulnerability announce impacts software or systems such as Fedora, Linux.

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

Solutions for this threat 

Linux kernel: version 5.5.3.
The version 5.5.3 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.19.
The version 5.4.19 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.103.
The version 4.19.103 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for KVM Missing TLB Flushes.
A patch is indicated in information sources.

Fedora: new kernel-headers packages.
New packages are available:
  Fedora 30: kernel-headers 5.4.18-100.fc30
  Fedora 31: kernel-headers 5.4.18-200.fc31

Fedora: new kernel packages.
New packages are available:
  Fedora 30: kernel 5.4.19-100.fc30
  Fedora 31: kernel 5.4.19-200.fc31
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Computer vulnerabilities tracking service 

Vigil@nce provides an application vulnerability patch. The Vigil@nce security watch publishes vulnerability bulletins about threats impacting the information system.