CVE-2021-4147

libvirt: deadlock and crash in libxl driver

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Severity

Low

Red Hat Product Security

6.5

CVSS 3.1

Review impact separately from score.

Published · November 29, 2021

Updated · June 28, 2026

Description

A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause libvirtd on the host to deadlock or crash, resulting in a denial of service condition.

Statement

The versions of libvirt as shipped with Red Hat Enterprise Linux do not support the libxl hypervisor driver for Xen. Therefore, Red Hat Enterprise Linux is not affected by this flaw.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CWE-667 · Improper Locking