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Vulnerability of QEMU: memory leak via VNC Disconnect

Synthesis of the vulnerability 

An attacker, inside a guest system, can create a memory leak via VNC Disconnect of QEMU, in order to trigger a denial of service on the host system.
Impacted systems: Debian, openSUSE Leap, QEMU, RHEL, Ubuntu.
Severity of this alert: 2/4.
Creation date: 05/03/2020.
Références of this alert: CVE-2019-20382, DLA-2288-1, DSA-4665-1, openSUSE-SU-2020:0468-1, RHSA-2020:2774-01, RHSA-2020:3906-01, RHSA-2020:3907-01, USN-4372-1, VIGILANCE-VUL-31733.

Description of the vulnerability 

An attacker, inside a guest system, can create a memory leak via VNC Disconnect of QEMU, in order to trigger a denial of service on the host system.
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This threat note impacts software or systems such as Debian, openSUSE Leap, QEMU, RHEL, Ubuntu.

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

Solutions for this threat 

QEMU: patch for VNC Disconnect.
A patch is indicated in information sources.

Debian 10: new qemu packages.
New packages are available:
  Debian 10: qemu 1:3.1+dfsg-8+deb10u5

Debian 9: new qemu packages.
New packages are available:
  Debian 9: qemu 1:2.8+dfsg-6+deb9u10

openSUSE Leap 15.1: new qemu packages.
New packages are available:
  openSUSE Leap 15.1: qemu 3.1.1.1-lp151.7.12.1

RHEL 7.8: new qemu-kvm-ma packages.
New packages are available:
  RHEL 7.0-7.8: qemu-kvm-ma 2.12.0-48.el7

RHEL 7.8: new qemu-kvm packages.
New packages are available:
  RHEL 7.0-7.8: qemu-kvm 1.5.3-175.el7

RHEL 8.0: new virt-rhel module (30/06/2020).
The following module is updated:
  RHEL 8.0 Module: virt:rhel

Ubuntu: new qemu packages.
New packages are available:
  Ubuntu 20.04 LTS: qemu 1:4.2-3ubuntu6.1
  Ubuntu 19.10: qemu 1:4.0+dfsg-0ubuntu9.6
  Ubuntu 18.04 LTS: qemu 1:2.11+dfsg-1ubuntu7.26
  Ubuntu 16.04 LTS: qemu 1:2.5+dfsg-5ubuntu10.44

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

Wind River Linux: version 10.18.44.15.
The version 10.18.44.15 is fixed:
  https://support2.windriver.com/
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