# CVE-2016-7907: Denial of service in n/a

> Local guest administrators can crash the QEMU process via an infinite loop in the imx_fec network driver, causing denial of service.

- **Severity:** Medium 4.4 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 5 Oct 2016
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2016-7907, GHSA-9mcc-p2hp-9p52, UBUNTU-CVE-2016-7907

## What is CVE-2016-7907?

CVE-2016-7907 is a medium-severity denial of service vulnerability in Qemu Qemu, published on 5 Oct 2016. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The imx_fec_do_tx function in hw/net/imx_fec.c in QEMU (aka Quick Emulator) does not properly limit the buffer descriptor count when transmitting packets, which allows local guest OS administrators to cause a denial of service (infinite loop and QEMU process crash) via vectors involving a buffer descriptor with a length of 0 and crafted values in bd.flags.

Weakness: CWE-399, CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2016-7907?

It affects 1 product.


Products: Qemu Qemu.

## How do I fix CVE-2016-7907?

Apply the vendor's patch.

## Is CVE-2016-7907 being exploited?

There is no known exploitation of CVE-2016-7907 in the wild and no public exploit code.

## Other vulnerabilities in Qemu Qemu

- [CVE-2022-36648](https://insights.sbomify.com/CVE-2022-36648/): Null dereference in n/a (critical 10.0)
- [CVE-2015-8556](https://insights.sbomify.com/CVE-2015-8556/): Race condition in n/a (critical 10.0)
- [CVE-2009-3616](https://insights.sbomify.com/CVE-2009-3616/): Use after free in n/a (critical 9.9)
- [CVE-2019-12928](https://insights.sbomify.com/CVE-2019-12928/): Command injection in n/a (critical 9.8)
- [CVE-2019-12929](https://insights.sbomify.com/CVE-2019-12929/): Command injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-7907 and fix it if it is affected.

What it is: CVE-2016-7907 is a medium-severity denial of service vulnerability in Qemu Qemu, published on 5 Oct 2016. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2016-7907 in the wild and no public exploit code.

Affected product: Qemu Qemu. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2016-7907/ (Markdown: https://insights.sbomify.com/CVE-2016-7907/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-7907
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-7907
- OSV: https://osv.dev/vulnerability/CVE-2016-7907

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-7907/
Summaries are generated and may contain mistakes; the official description above is the record.