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Vulnerability of QEMU: buffer overflow via msix_table_mmio_write

Synthesis of the vulnerability 

An attacker, inside a guest system, can trigger a buffer overflow via msix_table_mmio_write() of QEMU, in order to trigger a denial of service, and possibly to run code on the host system.
Vulnerable software: openSUSE Leap, QEMU, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this announce: 2/4.
Creation date: 09/12/2020.
Références of this computer vulnerability: CVE-2020-27821, openSUSE-SU-2021:0600-1, RHBUG-1902651, SUSE-SU-2021:1242-1, SUSE-SU-2021:1243-1, SUSE-SU-2021:1245-1, USN-4725-1, VIGILANCE-VUL-34069.

Description of the vulnerability 

An attacker, inside a guest system, can trigger a buffer overflow via msix_table_mmio_write() of QEMU, in order to trigger a denial of service, and possibly to run code on the host system.
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This cybersecurity alert impacts software or systems such as openSUSE Leap, QEMU, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this weakness 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 security weakness.

Solutions for this threat 

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

openSUSE Leap 15.2: new qemu packages.
New packages are available:
  openSUSE Leap 15.2: qemu 4.2.1-lp152.9.12.1

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 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 4.2.1-11.16.3

Ubuntu: new qemu packages.
New packages are available:
  Ubuntu 20.10: qemu 1:5.0-5ubuntu9.4
  Ubuntu 20.04 LTS: qemu 1:4.2-3ubuntu6.12
  Ubuntu 18.04 LTS: qemu 1:2.11+dfsg-1ubuntu7.35
  Ubuntu 16.04 LTS: qemu 1:2.5+dfsg-5ubuntu10.49
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