CVE-2020-14339

A flaw was found in libvirt, where it leaked a file descriptor for /dev/mapper/control into the QEMU process. This file descriptor allows for privileged operations to happen against the device-mapper on the host. This flaw allows a malicious guest user or process to perform operations outside of their standard permissions, potentially causing serious damage to the host operating system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

This flaw was introduced in libvirt version 6.2.0. Red Hat Enterprise Linux 5, 6, 7, and 8 are not affected by this issue as they shipped an older version of the libvirt package which did not include the vulnerable code.

This issue affects versions of the libvirt package as shipped with Red Hat Enterprise Linux Advanced Virtualization 8. Future libvirt package updates for Red Hat Enterprise Linux Advanced Virtualization 8 may address this issue.

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.

This issue is mitigated on Red Hat Enterprise Linux if SELinux is in enforcing mode, which prevents the /dev/mapper/control file descriptor from being accessible by a guest user/process.