---
title: "CVE-2026-17052: Zephyr Time-aware GPIO - Write-What-Where"
description: "Zephyr Time-aware GPIO (CONFIG_USERSPACE=y and CONFIG_TIMEAWARE_GPIO=y) contains a write-what-where vulnerability caused by missing K_SYSCALL_MEMORY_WRITE() checks in z_vrfy_tgpio_pin_read_ts_ec(), letting unprivileged users with device access write arbitrary kernel memory, exploit requires access to TGPIO device object."
url: https://panop.io/threat-heartbeat/CVE-2026-17052/
---

# CVE-2026-17052 Zephyr Time-aware GPIO - Write-What-Where

Zephyr Time-aware GPIO (CONFIG\_USERSPACE=y and CONFIG\_TIMEAWARE\_GPIO=y) contains a write-what-where vulnerability caused by missing K\_SYSCALL\_MEMORY\_WRITE() checks in z\_vrfy\_tgpio\_pin\_read\_ts\_ec(), letting unprivileged users with device access write arbitrary kernel memory, exploit requires access to TGPIO device object.

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-2026-17052)

## Details

Type

Write-What-Where

Impact

Privilege Escalation, Denial Of Service, File System Write

CVSS vector

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

Published

21 September 2026

Updated

15 October 2026

Weakness

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

## Vendor fix

Update to Zephyr version 4.4.0 or later where the missing memory write checks are added.

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-2026-17052](https://nvd.nist.gov/vuln/detail/CVE-2026-17052)
- [https://github.com/zephyrproject-rtos/zephyr/commit/26264fffc17c2174319394ffa274af3f6efdc221](https://github.com/zephyrproject-rtos/zephyr/commit/26264fffc17c2174319394ffa274af3f6efdc221)
- [https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-8qw6-x76h-8mpc](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-8qw6-x76h-8mpc)

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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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