---
title: "CVE-2026-19569: Zephyr Kernel - Buffer Overflow"
description: "Zephyr kernel with CONFIG_USERSPACE and CONFIG_DYNAMIC_OBJECTS contains a buffer overflow caused by unchecked unsigned integer wrap-around in dynamic_object_create() size calculations, letting unprivileged user-mode threads perform out-of-bounds writes to kernel heap, exploit requires CONFIG_USERSPACE, CONFIG_DYNAMIC_OBJECTS, and a thread with assigned resource pool."
url: https://panop.io/threat-heartbeat/CVE-2026-19569/
---

# CVE-2026-19569 Zephyr Kernel - Buffer Overflow

Zephyr kernel with CONFIG\_USERSPACE and CONFIG\_DYNAMIC\_OBJECTS contains a buffer overflow caused by unchecked unsigned integer wrap-around in dynamic\_object\_create() size calculations, letting unprivileged user-mode threads perform out-of-bounds writes to kernel heap, exploit requires CONFIG\_USERSPACE, CONFIG\_DYNAMIC\_OBJECTS, and a thread with assigned resource pool.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.12% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-19569)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Data Tampering

CVSS vector

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

Published

9 October 2026

Updated

15 October 2026

Weakness

[CWE-190](https://cwe.mitre.org/data/definitions/190.html)

## Vendor fix

Update to a version that rejects overflowing size computations and frees partially built descriptors; otherwise, upgrade to the latest Zephyr version.

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-2026-19569](https://nvd.nist.gov/vuln/detail/CVE-2026-19569)
- [https://github.com/zephyrproject-rtos/zephyr/commit/85c1c4c21945d9b8fcef03216f1ccb2b27794e3d](https://github.com/zephyrproject-rtos/zephyr/commit/85c1c4c21945d9b8fcef03216f1ccb2b27794e3d)
- [https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fg8c-9fhq-q7hv](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fg8c-9fhq-q7hv)

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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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