CVE-2020-10717

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-05-04 · updated 2026-06-17
Weakness: CWE-770

Description

A potential DoS flaw was found in the virtio-fs shared file system daemon (virtiofsd) implementation of the QEMU version >= v5.0. Virtio-fs is meant to share a host file system directory with a guest via virtio-fs device. If the guest opens the maximum number of file descriptors under the shared directory, a denial of service may occur. This flaw allows a guest user/process to cause this denial of service on the host.

Affected products

QEMU: from 5.0 before 5.0.1 — fixed in 5.0.1

How to fix

Upgrade to a fixed version: QEMU 5.0.1. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10717
https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00141.html
https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00143.html
https://security.gentoo.org/glsa/202011-09
https://www.openwall.com/lists/oss-security/2020/05/04/1
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10717
https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00141.html
https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00143.html
https://security.gentoo.org/glsa/202011-09
https://www.openwall.com/lists/oss-security/2020/05/04/1

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