# CVE-2026-4179: stm32: usb: Infinite while loop in Interrupt Handler

> An infinite loop in the Zephyr RTOS STM32 USB driver allows attackers to cause a denial of service.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Mar 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-9xg7-g3q3-9prf

## What is CVE-2026-4179?

CVE-2026-4179 is a medium-severity denial of service vulnerability in Zephyrproject Zephyr, published on 14 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Issues in stm32 USB device driver (drivers/usb/device/usb_dc_stm32.c) can lead to an infinite while loop.

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

## Which versions are affected by CVE-2026-4179?

It affects 1 product.


Products: Zephyrproject Zephyr.

## How do I fix CVE-2026-4179?

No fix has been published for CVE-2026-4179 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4179 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4179 exists.

## Other vulnerabilities in Zephyrproject Zephyr

- [CVE-2026-5067](https://insights.sbomify.com/CVE-2026-5067/): Out-of-bounds read/write in HTTP WebSocket upgrade via non-null-terminated Sec-WebSocket-Key (critical 9.8)
- [CVE-2022-3806](https://insights.sbomify.com/CVE-2022-3806/): Bluetooth HCI Error Handling Double Free (critical 9.8)
- [CVE-2017-14199](https://insights.sbomify.com/CVE-2017-14199/): Memory corruption in getaddrinfo (critical 9.8)
- [CVE-2018-1000800](https://insights.sbomify.com/CVE-2018-1000800/): Null dereference in n/a (critical 9.8)
- [CVE-2021-3329](https://insights.sbomify.com/CVE-2021-3329/): DOS: Incorrect handling of the initial HCI ACL_MTU handshake packet leads to crash of bluetooth host layer (critical 9.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4179 and fix it if it is affected.

What it is: CVE-2026-4179 is a medium-severity denial of service vulnerability in Zephyrproject Zephyr, published on 14 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4179 exists.

Affected product: Zephyrproject Zephyr. 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-2026-4179/ (Markdown: https://insights.sbomify.com/CVE-2026-4179/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4179
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4179
- OSV: https://osv.dev/vulnerability/CVE-2026-4179

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4179/
Summaries are generated and may contain mistakes; the official description above is the record.