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Vulnerability of Xen: denial of service via X86 HVM IRQ Vector

Synthesis of the vulnerability 

An attacker, inside a guest system, can trigger a fatal error via X86 HVM IRQ Vector of Xen, in order to trigger a denial of service on the host system.
Vulnerable software: XenServer, Fedora, SUSE Linux Enterprise Desktop, SLES, Xen.
Severity of this announce: 2/4.
Creation date: 21/01/2021.
Références of this computer vulnerability: CERTFR-2021-AVI-053, CERTFR-2021-AVI-086, CTX291439, CVE-2021-3308, FEDORA-2021-16c9c40d4d, FEDORA-2021-7785f6c616, SUSE-SU-2021:1023-1, SUSE-SU-2021:1028-1, VIGILANCE-VUL-34399, XSA-360.

Description of the vulnerability 

An attacker, inside a guest system, can trigger a fatal error via X86 HVM IRQ Vector of Xen, in order to trigger a denial of service on the host system.
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This computer vulnerability alert impacts software or systems such as XenServer, Fedora, SUSE Linux Enterprise Desktop, SLES, Xen.

Our Vigil@nce team determined that the severity of this computer threat alert is medium.

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 security vulnerability.

Solutions for this threat 

Xen: patch for X86 HVM IRQ Vector.
A patch is available:
  http://xenbits.xen.org/xsa/xsa360.patch
  http://xenbits.xen.org/xsa/xsa360-4.14.patch

Citrix Hypervisor: patch for X86 HVM IRQ Vector.
A patch is available:
  https://support.citrix.com/article/CTX292625

Fedora 32: new xen packages.
New packages are available:
  Fedora 32: xen 4.13.2-6.fc32

Fedora 33: new xen packages.
New packages are available:
  Fedora 33: xen 4.14.1-2.fc33

SUSE LE 12 SP5: new xen packages (07/04/2021).
New packages are available:
  SUSE LE 12 SP5: xen 4.12.4_09-3.39.3

SUSE LE 15 SP2: new xen packages.
New packages are available:
  SUSE LE 15 SP2: xen 4.13.2_08-3.25.3
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