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Vulnerability of Xen: NULL pointer dereference via FIFO Event Channels Structure

Synthesis of the vulnerability 

An attacker, inside a guest system, can force a NULL pointer to be dereferenced via FIFO Event Channels Structure of Xen, in order to trigger a denial of service on the host system.
Vulnerable software: Debian, Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.
Severity of this announce: 1/4.
Creation date: 15/12/2020.
Références of this computer vulnerability: CVE-2020-29571, DSA-4812-1, FEDORA-2020-64859a826b, FEDORA-2020-df772b417b, openSUSE-SU-2020:2313-1, openSUSE-SU-2020:2331-1, SUSE-SU-2020:14578-1, SUSE-SU-2020:3880-1, SUSE-SU-2020:3881-1, SUSE-SU-2020:3913-1, SUSE-SU-2020:3914-1, SUSE-SU-2020:3915-1, SUSE-SU-2020:3916-1, SUSE-SU-2020:3945-1, VIGILANCE-VUL-34123, XSA-359.

Description of the vulnerability 

An attacker, inside a guest system, can force a NULL pointer to be dereferenced via FIFO Event Channels Structure of Xen, in order to trigger a denial of service on the host system.
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This vulnerability impacts software or systems such as Debian, Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.

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

Solutions for this threat 

Xen: patch for FIFO Event Channels Structure.
A patch is available:
  http://xenbits.xen.org/xsa/xsa359.patch

Debian 10: new xen packages.
New packages are available:
  Debian 10: xen 4.11.4+57-g41a822c392-2

Fedora 32-33: new xen packages.
New packages are available:
  Fedora 32: xen 4.13.2-5.fc32
  Fedora 33: xen 4.14.0-14.fc33

openSUSE Leap 15.1: new xen packages.
New packages are available:
  openSUSE Leap 15.1: xen 4.12.4_06-lp151.2.36.1

openSUSE Leap 15.2: new xen packages.
New packages are available:
  openSUSE Leap 15.2: xen 4.13.2_06-lp152.2.21.1

SUSE LE 11 SP4: new xen packages.
New packages are available:
  SUSE LE 11 SP4: xen 4.4.4_48-61.61.1

SUSE LE 12 SP2: new xen packages.
New packages are available:
  SUSE LE 12 SP2: xen 4.7.6_14-43.73.1

SUSE LE 12 SP3: new xen packages.
New packages are available:
  SUSE LE 12 SP3: xen 4.9.4_16-3.80.1

SUSE LE 12 SP4: new xen packages.
New packages are available:
  SUSE LE 12 SP4: xen 4.11.4_16-2.48.1

SUSE LE 12 SP5: new xen packages.
New packages are available:
  SUSE LE 12 SP5: xen 4.12.4_06-3.36.1

SUSE LE 15 RTM: new xen packages.
New packages are available:
  SUSE LE 15 RTM: xen 4.10.4_24-3.53.1

SUSE LE 15 SP1: new xen packages.
New packages are available:
  SUSE LE 15 SP1: xen 4.12.4_06-3.40.1

SUSE LE 15 SP2: new xen packages.
New packages are available:
  SUSE LE 15 SP2: xen 4.13.2_06-3.22.1
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