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Synthesis of the vulnerability 
An attacker, inside a guest system, can trigger a fatal error via Linux Event Handler Race of Xen, in order to trigger a denial of service on the host system.
 Impacted systems: XenServer, Debian, Fedora, Linux, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this alert: 1/4.
Creation date: 20/10/2020.
Références of this alert: CERTFR-2020-AVI-657, CERTFR-2020-AVI-693, CERTFR-2020-AVI-741, CERTFR-2020-AVI-764, CERTFR-2020-AVI-769, CERTFR-2020-AVI-784, CERTFR-2020-AVI-834, CERTFR-2021-AVI-006, CTX284874, CVE-2020-27675, DLA-2483-1, DLA-2494-1, FEDORA-2020-09e4d062fe, FEDORA-2020-474d747b60, FEDORA-2020-920a258c79, SUSE-SU-2020:3272-1, SUSE-SU-2020:3281-1, SUSE-SU-2020:3491-1, SUSE-SU-2020:3532-1, SUSE-SU-2020:3544-1, USN-4679-1, USN-4680-1, USN-4681-1, VIGILANCE-VUL-33629, XSA-331.
Description of the vulnerability 
An attacker, inside a guest system, can trigger a fatal error via Linux Event Handler Race of Xen, in order to trigger a denial of service on the host system.
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This cybersecurity alert impacts software or systems such as XenServer, Debian, Fedora, Linux, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Our Vigil@nce team determined that the severity of this weakness 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 security weakness.
Solutions for this threat 
Linux kernel: version 5.9.5.
The version 5.9.5 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v5.x/
Linux kernel: version 5.4.75.
The version 5.4.75 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v5.x/
Linux kernel: version 4.19.155.
The version 4.19.155 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v4.x/
Linux kernel: version 4.14.204.
The version 4.14.204 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v4.x/
Linux kernel: patch for Xen Linux Event Handler Race.
A patch is available:
http://xenbits.xen.org/xsa/xsa331-linux.patch
Citrix Hypervisor, XenServer: patch.
A patch is available:
Citrix Hypervisor 8.2 LTSR: https://support.citrix.com/article/CTX285310 + https://support.citrix.com/article/CTX285316
Citrix Hypervisor 8.1: https://support.citrix.com/article/CTX285309 + https://support.citrix.com/article/CTX285315
Citrix XenServer 7.1 LTSR CU2: https://support.citrix.com/article/CTX285308 + https://support.citrix.com/article/CTX285314
Citrix XenServer 7.0: https://support.citrix.com/article/CTX285307 + https://support.citrix.com/article/CTX285312
Debian 9: new linux-4.19 packages (10/12/2020).
New packages are available:
Debian 9: linux-4.19 4.19.160-2~deb9u1
Debian 9: new linux packages.
New packages are available:
Debian 9: linux 4.9.246-2
Fedora 31-33: new kernel packages.
New packages are available:
Fedora 31: kernel 5.8.17-100.fc31
Fedora 32: kernel 5.8.17-200.fc32
Fedora 33: kernel 5.8.17-300.fc33
SUSE LE 12 SP4: new kernel-default packages.
New packages are available:
SUSE LE 12 SP4: kernel-default 4.12.14-95.65.1
SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
SUSE LE 12 SP5: kernel-azure 4.12.14-16.34.1
SUSE LE 15: new kernel packages.
New packages are available:
SUSE LE 15 RTM: kernel-default-livepatch 4.12.14-150.63.1, kernel-livepatch 4_12_14-150_63-default-1-1.5.1
SUSE LE 15 SP1: new kernel packages.
New packages are available:
SUSE LE 15 SP1: kernel 4.12.14-197.67.1
SUSE LE 15 SP2: new kernel-azure packages (24/11/2020).
New packages are available:
SUSE LE 15 SP2: kernel-azure 5.3.18-18.24.1
Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1103.78
Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.129.128
Ubuntu 18.04 LTS: linux-image-generic 4.15.0.129.116
Ubuntu: new linux-image-4.4.0 packages (06/01/2021).
New packages are available:
Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.198.173
Ubuntu 16.04 LTS: linux-image-generic 4.4.0.198.204
Ubuntu: new linux-image-5.4.0 packages.
New packages are available:
Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.4.0.59.65~18.04.54
Ubuntu 20.04 LTS: linux-image-generic 5.4.0.59.62
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