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Vulnerability of QEMU: integer overflow via vmxnet3

Synthesis of the vulnerability 

An attacker, inside a guest system, can trigger an integer overflow via vmxnet3 of QEMU, in order to trigger a denial of service, and possibly to run code on the host system.
Vulnerable products: Debian, openSUSE Leap, QEMU, SUSE Linux Enterprise Desktop, SLES.
Severity of this weakness: 2/4.
Creation date: 19/02/2021.
Références of this bulletin: CVE-2021-20203, DLA-2623-1, openSUSE-SU-2021:0363-1, SUSE-SU-2021:0521-1, SUSE-SU-2021:1240-1, SUSE-SU-2021:1241-1, SUSE-SU-2021:1242-1, SUSE-SU-2021:1244-1, SUSE-SU-2021:1245-1, SUSE-SU-2021:1305-1, VIGILANCE-VUL-34626.

Description of the vulnerability 

An attacker, inside a guest system, can trigger an integer overflow via vmxnet3 of QEMU, in order to trigger a denial of service, and possibly to run code on the host system.
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This threat alert impacts software or systems such as Debian, openSUSE Leap, QEMU, SUSE Linux Enterprise Desktop, SLES.

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

Solutions for this threat 

QEMU: patch for vmxnet3.
A patch is indicated in information sources.

Debian 9: new qemu packages (12/04/2021).
New packages are available:
  Debian 9: qemu 1:2.8+dfsg-6+deb9u14

openSUSE Leap 15.2: new qemu packages.
New packages are available:
  openSUSE Leap 15.2: qemu 4.2.1-lp152.9.9.2

SUSE LE 12 SP2: new qemu packages.
New packages are available:
  SUSE LE 12 SP2: qemu 2.6.2-41.62.1

SUSE LE 12 SP3: new qemu packages.
New packages are available:
  SUSE LE 12 SP3: qemu 2.9.1-6.47.1

SUSE LE 12 SP4: new qemu packages.
New packages are available:
  SUSE LE 12 SP4: qemu 2.11.2-5.29.1

SUSE LE 12 SP5: new qemu packages.
New packages are available:
  SUSE LE 12 SP5: qemu 3.1.1.1-48.2

SUSE LE 15 RTM: new qemu packages.
New packages are available:
  SUSE LE 15 RTM: qemu 2.11.2-9.43.1

SUSE LE 15 SP1: new qemu packages.
New packages are available:
  SUSE LE 15 SP1: qemu 3.1.1.1-9.24.3

SUSE LE 15 SP2: new qemu packages.
New packages are available:
  SUSE LE 15 SP2: qemu 4.2.1-11.13.1
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