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Vulnerability of Xen: denial of service via XENMEM_acquire_resource

Synthesis of the vulnerability 

An attacker, inside a guest system, can trigger a livelock via XENMEM_acquire_resource of Xen, in order to trigger a denial of service on the host system.
Vulnerable systems: Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.
Severity of this threat: 1/4.
Creation date: 22/09/2020.
Références of this weakness: CERTFR-2020-AVI-593, CVE-2020-25598, FEDORA-2020-d46fe34349, FEDORA-2020-f668e579be, openSUSE-SU-2020:1608-1, SUSE-SU-2020:2786-1, SUSE-SU-2020:2787-1, SUSE-SU-2020:2788-1, SUSE-SU-2020:2789-1, SUSE-SU-2020:2790-1, SUSE-SU-2020:2791-1, VIGILANCE-VUL-33386, XSA-334.

Description of the vulnerability 

An attacker, inside a guest system, can trigger a livelock via XENMEM_acquire_resource of Xen, in order to trigger a denial of service on the host system.
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This computer vulnerability announce impacts software or systems such as Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.

Our Vigil@nce team determined that the severity of this cybersecurity bulletin 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 threat alert.

Solutions for this threat 

Xen: patch for XENMEM_acquire_resource.
A patch is available:
  http://xenbits.xen.org/xsa/xsa334-4.12.patch
  http://xenbits.xen.org/xsa/xsa334.patch

Fedora 31: new xen packages.
New packages are available:
  Fedora 31: xen 4.12.3-5.fc31

Fedora 32: new xen packages.
New packages are available:
  Fedora 32: xen 4.13.1-6.fc32

openSUSE Leap 15.2: new xen packages.
New packages are available:
  openSUSE Leap 15.2: xen 4.13.1_08-lp152.2.9.1

SUSE LE: new xen packages.
New packages are available:
  SUSE LE 12 SP3: xen 4.9.4_12-3.74.1
  SUSE LE 12 SP4: xen 4.11.4_08-2.36.1
  SUSE LE 12 SP5: xen 4.12.3_08-3.24.1
  SUSE LE 15 RTM: xen 4.10.4_16-3.41.1
  SUSE LE 15 SP1: xen 4.12.3_08-3.28.1
  SUSE LE 15 SP2: xen 4.13.1_08-3.10.1
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