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Vulnerability of Xen: denial of service via find_next_bit

Synthesis of the vulnerability 

An attacker, inside a guest system, can trigger a fatal error via find_next_bit() 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: 2/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 11/12/2019.
Références of this computer vulnerability: CERTFR-2019-AVI-628, CVE-2019-19581, CVE-2019-19582, DSA-4602-1, FEDORA-2019-2e12bd3a9a, openSUSE-SU-2020:0011-1, SUSE-SU-2019:3296-1, SUSE-SU-2019:3297-1, SUSE-SU-2019:3309-1, SUSE-SU-2019:3310-1, SUSE-SU-2019:3338-1, SUSE-SU-2020:0334-1, SUSE-SU-2020:0388-1, VIGILANCE-VUL-31123, XSA-307.

Description of the vulnerability 

An attacker, inside a guest system, can trigger a fatal error via find_next_bit() of Xen, in order to trigger a denial of service on the host system.
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This computer weakness announce 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 alert is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

This bulletin is about 2 vulnerabilities.

An attacker with a expert ability can exploit this vulnerability.

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 find_next_bit.
A patch is available:
  http://xenbits.xen.org/xsa/xsa307.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 4.11.3-2.fc30

openSUSE Leap 15.1: new xen packages.
New packages are available:
  openSUSE Leap 15.1: xen 4.12.1_06-lp151.2.9.1

SUSE LE 12 SP1: new xen packages.
New packages are available:
  SUSE LE 12 SP1: xen 4.5.5_28-22.64.1

SUSE LE 12 SP2: new xen packages.
New packages are available:
  SUSE LE 12 SP2: xen 4.7.6_06-43.59.1

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 12 SP5: new xen packages.
New packages are available:
  SUSE LE 12 SP5: xen 4.12.1_10-3.8.1

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_06-3.9.1
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