---
title: "CVE-2026-19669: Zephyr Fuel Gauge - Buffer Overflow"
description: "Zephyr drivers/fuel_gauge contains a buffer overflow caused by unvalidated variable-length arrays sized by attacker-controlled len in syscall verifiers, letting user-mode attackers with device access execute kernel code or crash the system, exploit requires user-mode access with CONFIG_USERSPACE enabled and fuel-gauge device permissions."
url: https://panop.io/threat-heartbeat/CVE-2026-19669/
---

# CVE-2026-19669 Zephyr Fuel Gauge - Buffer Overflow

Zephyr drivers/fuel\_gauge contains a buffer overflow caused by unvalidated variable-length arrays sized by attacker-controlled len in syscall verifiers, letting user-mode attackers with device access execute kernel code or crash the system, exploit requires user-mode access with CONFIG\_USERSPACE enabled and fuel-gauge device permissions.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.12% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-19669)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

11 October 2026

Updated

15 October 2026

Weakness

[CWE-787](https://cwe.mitre.org/data/definitions/787.html)

## Vendor fix

Update to the fixed version where kernel-side copies are removed and caller arrays are validated with K\_SYSCALL\_MEMORY\_ARRAY\_READ/WRITE.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-19669](https://nvd.nist.gov/vuln/detail/CVE-2026-19669)
- [https://github.com/zephyrproject-rtos/zephyr/commit/0d65ce46dda0626164503c50f37e6e1f59d310a9](https://github.com/zephyrproject-rtos/zephyr/commit/0d65ce46dda0626164503c50f37e6e1f59d310a9)
- [https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-6ghg-cmrw-8gw5](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-6ghg-cmrw-8gw5)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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