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Vulnerability of Xen: memory leak via XS_RESET_WATCHES

Synthesis of the vulnerability 

An attacker, inside a guest system, can create a memory leak via XS_RESET_WATCHES of Xen, in order to trigger a denial of service on the host system.
Impacted software: XenServer, Debian, Fedora, Xen.
Severity of this computer vulnerability: 1/4.
Creation date: 15/12/2020.
Références of this announce: CERTFR-2020-AVI-824, CERTFR-2020-AVI-825, CTX286756, CVE-2020-29485, DSA-4812-1, FEDORA-2020-64859a826b, FEDORA-2020-df772b417b, VIGILANCE-VUL-34114, XSA-330.

Description of the vulnerability 

An attacker, inside a guest system, can create a memory leak via XS_RESET_WATCHES of Xen, in order to trigger a denial of service on the host system.
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This computer weakness impacts software or systems such as XenServer, Debian, Fedora, Xen.

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

Solutions for this threat 

Xen: patch for XS_RESET_WATCHES.
A patch is available:
  http://xenbits.xen.org/xsa/xsa330.patch
  http://xenbits.xen.org/xsa/xsa330-4.11.patch

Citrix Hypervisor, XenServer: patch.
A patch is indicated in information sources.

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
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