CVE-2020-35517
QEMU: virtiofsd: potential privileged host device access from guest
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · January 21, 2021
Updated · June 28, 2026
Description
A flaw was found in qemu. A host privilege escalation issue was found in the virtio-fs shared file system daemon where a privileged guest user is able to create a device special file in the shared directory and use it to r/w access host devices. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Statement
This issue does not affect the version of the qemu-kvm package as shipped with the Red Hat Enterprise Linux 5, 6 and 7. Virtio-fs is fairly new and is not built in the Red Hat Enterprise Linux 5, 6 and 7.
This issue affects the version of the qemu-kvm package as shipped with the Red Hat Enterprise Linux 8. Future qemu-kvm package updates for Red Hat Enterprise Linux 8 may address this issue.
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 · 7.5CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE-269 · Improper Privilege Management