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Vulnerability of Xen: denial of service via add-to-physmap

Synthesis of the vulnerability 

An attacker, inside a guest system, can trigger a fatal error via add-to-physmap of Xen, in order to trigger a denial of service on the host system.
Impacted products: Debian, Fedora, SUSE Linux Enterprise Desktop, SLES, Xen.
Severity of this bulletin: 1/4.
Creation date: 31/10/2019.
Références of this threat: CERTFR-2019-AVI-541, CVE-2019-18423, DSA-4602-1, FEDORA-2019-cbb732f760, SUSE-SU-2019:2961-1, SUSE-SU-2019:3297-1, SUSE-SU-2019:3309-1, SUSE-SU-2019:3310-1, VIGILANCE-VUL-30759, XSA-301.

Description of the vulnerability 

An attacker, inside a guest system, can trigger a fatal error via add-to-physmap of Xen, in order to trigger a denial of service on the host system.
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This computer weakness alert impacts software or systems such as Debian, Fedora, SUSE Linux Enterprise Desktop, SLES, Xen.

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

Solutions for this threat 

Xen: version 4.12.2.
The version 4.12.2 is fixed:
  http://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.12
  https://xenproject.org/downloads/xen-project-archives/xen-project-4-12-series/xen-project-4-12-2/

Xen: version 4.11.3.
The version 4.11.3 is fixed:
  http://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.11
  https://xenproject.org/downloads/xen-project-archives/xen-project-4-11-series/xen-project-4-11-3/

Xen: patch for add-to-physmap.
A patch is available:
  http://xenbits.xen.org/xsa/xsa301.meta
  http://xenbits.xen.org/xsa/xsa301-4.11-1.patch
  http://xenbits.xen.org/xsa/xsa301-4.11-2.patch
  http://xenbits.xen.org/xsa/xsa301-4.11-3.patch
  http://xenbits.xen.org/xsa/xsa301-master-1.patch
  http://xenbits.xen.org/xsa/xsa301-master-2.patch
  http://xenbits.xen.org/xsa/xsa301-master-3.patch

Debian 9/10: new xen packages.
New packages are available:
  Debian 9: xen 4.8.5.final+shim4.10.4-1+deb9u12
  Debian 10: xen 4.11.3+24-g14b62ab3e5-1~deb10u1

Fedora 30: new xen packages.
New packages are available:
  Fedora 30: xen 4.11.2-3.fc30

SUSE LE 12 SP3: new xen packages.
New packages are available:
  SUSE LE 12 SP3: xen 4.9.4_06-3.59.1

SUSE LE 12 SP4: new xen packages (18/12/2019).
New packages are available:
  SUSE LE 12 SP4: xen 4.11.3_02-2.20.1

SUSE LE 15 RTM: new xen packages.
New packages are available:
  SUSE LE 15 RTM: xen 4.10.4_08-3.28.1

SUSE LE 15 SP1: new xen packages.
New packages are available:
  SUSE LE 15 SP1: xen 4.12.1_04-3.6.1
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