# CVE-2020-14394: Denial of service in QEMU

> A privileged guest user can cause a denial of service by triggering an infinite loop in QEMU's USB xHCI controller emulation.

- **Severity:** Low 3.2 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L`)
- **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:** 17 Aug 2022
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-14394, GHSA-9gg5-9c3q-7g76, OESA-2022-1918, UBUNTU-CVE-2020-14394

## What is CVE-2020-14394?

CVE-2020-14394 is a low-severity denial of service vulnerability in Fedoraproject Extra Packages for Enterprise Linux, published on 17 Aug 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An infinite loop flaw was found in the USB xHCI controller emulation of QEMU while computing the length of the Transfer Request Block (TRB) Ring. This flaw allows a privileged guest user to hang the QEMU process on the host, resulting in a denial of service.

Weakness: CWE-835 (Loop with Unreachable Exit Condition)

## Which versions are affected by CVE-2020-14394?

It affects 5 products.


Products: Fedoraproject Extra Packages for Enterprise Linux, Fedoraproject Fedora, Qemu Qemu, Redhat Enterprise Linux, Redhat Openstack Platform.

## How do I fix CVE-2020-14394?

Apply the vendor's patch.

## Is CVE-2020-14394 being exploited?

There is no known exploitation of CVE-2020-14394 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Extra Packages for Enterprise Linux

- [CVE-2023-34152](https://insights.sbomify.com/CVE-2023-34152/): Command injection in ImageMagick (critical 9.8)
- [CVE-2022-4170](https://insights.sbomify.com/CVE-2022-4170/): Code injection in rxvt-unicode (critical 9.8)
- [CVE-2022-40315](https://insights.sbomify.com/CVE-2022-40315/): Moodle Minor SQL injection risk in admin user browsing (critical 9.8)
- [CVE-2022-45152](https://insights.sbomify.com/CVE-2022-45152/): Moodle blind Server-Side Request Forgery (SSRF) vulnerability in LTI provider library (critical 9.1)
- [CVE-2022-24882](https://insights.sbomify.com/CVE-2022-24882/): Server side NTLM does not properly check parameters in FreeRDP (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-14394 and fix it if it is affected.

What it is: CVE-2020-14394 is a low-severity denial of service vulnerability in Fedoraproject Extra Packages for Enterprise Linux, published on 17 Aug 2022. 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-2020-14394 in the wild and no public exploit code.

Affected product: Fedoraproject Extra Packages for Enterprise Linux. 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-2020-14394/ (Markdown: https://insights.sbomify.com/CVE-2020-14394/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-14394
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-14394
- OSV: https://osv.dev/vulnerability/CVE-2020-14394

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-14394/
Summaries are generated and may contain mistakes; the official description above is the record.