---
title: "CVE-2026-19185: Zephyr OS - Broken Access Control"
description: "Zephyr OS with CONFIG_USERSPACE enabled contains a kernel memory disclosure and write vulnerability caused by improper validation of per-target data buffers in i3c_do_ccc() syscall, letting unprivileged user threads escalate to supervisor privileges by crafting malicious CCC payloads, exploit requires user-mode access to I3C controller device."
url: https://panop.io/threat-heartbeat/CVE-2026-19185/
---

# CVE-2026-19185 Zephyr OS - Broken Access Control

Zephyr OS with CONFIG\_USERSPACE enabled contains a kernel memory disclosure and write vulnerability caused by improper validation of per-target data buffers in i3c\_do\_ccc() syscall, letting unprivileged user threads escalate to supervisor privileges by crafting malicious CCC payloads, exploit requires user-mode access to I3C controller device.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.11% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-19185)

## Details

Type

Broken Access Control

Impact

Privilege Escalation, Information Disclosure, Data Tampering

CVSS vector

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

Published

5 October 2026

Updated

15 October 2026

Weakness

[CWE-822](https://cwe.mitre.org/data/definitions/822.html)

## Vendor fix

Update to a Zephyr OS version that includes the fix introducing copy\_ccc\_and\_do() with proper validation and memory copying.

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-2026-19185](https://nvd.nist.gov/vuln/detail/CVE-2026-19185)
- [https://github.com/zephyrproject-rtos/zephyr/commit/35562f22f40c6d2f31969a31f0a4902e5b067f27](https://github.com/zephyrproject-rtos/zephyr/commit/35562f22f40c6d2f31969a31f0a4902e5b067f27)
- [https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-pcrr-29j7-8w57](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-pcrr-29j7-8w57)

[← All CVEs](https://panop.io/threat-heartbeat/)

## 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

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)