---
title: "CVE-2026-19575: Zephyr OS - Privilege Escalation"
description: "Zephyr OS v4.2.x and v4.3.x with CONFIG_USERSPACE and CONFIG_DEVICE_DEINIT_SUPPORT enabled contains a privilege escalation vulnerability caused by improper validation of the dev argument in device_deinit() syscall, letting local unprivileged threads execute arbitrary kernel code, exploit requires CONFIG_USERSPACE and CONFIG_DEVICE_DEINIT_SUPPORT enabled."
url: https://panop.io/threat-heartbeat/CVE-2026-19575/
---

# CVE-2026-19575 Zephyr OS - Privilege Escalation

Zephyr OS v4.2.x and v4.3.x with CONFIG\_USERSPACE and CONFIG\_DEVICE\_DEINIT\_SUPPORT enabled contains a privilege escalation vulnerability caused by improper validation of the dev argument in device\_deinit() syscall, letting local unprivileged threads execute arbitrary kernel code, exploit requires CONFIG\_USERSPACE and CONFIG\_DEVICE\_DEINIT\_SUPPORT enabled.

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-2026-19575)

## Details

Type

Privilege Escalation

Impact

Remote Code Execution

CVSS vector

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

Published

9 October 2026

Updated

15 October 2026

Weakness

[CWE-843](https://cwe.mitre.org/data/definitions/843.html)

## Vendor fix

Update to Zephyr OS v4.4.0 or later with the fix that changes object validation to K\_OBJ\_DRIVER\_ANY or disable CONFIG\_DEVICE\_DEINIT\_SUPPORT if not needed.

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-2026-19575](https://nvd.nist.gov/vuln/detail/CVE-2026-19575)
- [https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-j9m4-fr5f-49wm](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-j9m4-fr5f-49wm)
- [https://github.com/zephyrproject-rtos/zephyr/commit/1036694889ab33996db41b4141ddf66aa786d267](https://github.com/zephyrproject-rtos/zephyr/commit/1036694889ab33996db41b4141ddf66aa786d267)

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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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