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PatchSiren cyber security CVE debrief

CVE-2026-4179 zephyrproject-rtos CVE debrief

A vulnerability in the Zephyr USB device driver can lead to an infinite while loop, potentially causing a denial-of-service condition. This issue affects Zephyr users, especially those with USB device functionality. The vulnerability is identified as CVE-2026-4179 and has a CVSS score of 6.1. Users should assess their exposure and consider applying patches or compensating controls. The vulnerability is caused by issues in the stm32 USB device driver (drivers/usb/device/usb_dc_stm32.c).

Vendor
zephyrproject-rtos
Product
Zephyr
CVSS
MEDIUM 6.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-03-14
Original CVE updated
2026-10-15
Advisory published
2026-03-14
Advisory updated
2026-10-15

Who should care

Zephyr users, especially those with USB device functionality, should assess their exposure and consider applying patches or compensating controls.

Why it matters

CVE-2026-4179 is a medium-severity vulnerability in the Zephyr USB device driver that could lead to a denial-of-service condition. Zephyr users, especially those with USB device functionality, should assess their exposure and consider applying patches or compensating controls.

  • Denial-of-service condition due to infinite while loop
  • Potential disruption of USB device functionality
  • Need for patching or compensating controls

Technical summary

The Zephyr USB device driver is vulnerable to an infinite while loop, which could lead to a denial-of-service condition. The vulnerability is identified as CVE-2026-4179 and has a CVSS score of 6.1. The issue is caused by problems in the stm32 USB device driver (drivers/usb/device/usb_dc_stm32.c). Users should review and apply patches from the Zephyr project to mitigate this vulnerability.

Defensive priority

Medium priority for Zephyr users, especially those with USB device functionality

Recommended defensive actions

  • Review and apply patches from the Zephyr project
  • Monitor USB device functionality for potential denial-of-service conditions
  • Consider implementing compensating controls for USB device security

Evidence notes

The CVE record and source item provide limited information about the vulnerability, with no specific details on exploitation or impact. The source item title is 'stm32: usb: Infinite while loop in Interrupt Handler'. The CVE Program record was published on 2026-03-14T21:51:33.203Z and has not been modified since then. The official CVE Program record and NIST NVD detail page provide additional context.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-4179 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-4179

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-4179 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-4179

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • stm32: usb: Infinite while loop in Interrupt Handler

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/4xxx/CVE-2026-4179.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

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

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.