---
title: "CVE-2026-19736: NXP MCUX TRNG - Buffer Overflow"
description: "NXP MCUX TRNG entropy driver in affected i.MX RT5xx and RT6xx devices contains a buffer overflow caused by improper handling of non-word-multiple byte requests in TRNG_GetRandomData(), letting unprivileged user-mode threads or kernel callers cause memory corruption beyond the buffer, exploit requires unprivileged access to entropy device or kernel mode call."
url: https://panop.io/threat-heartbeat/CVE-2026-19736/
---

# CVE-2026-19736 NXP MCUX TRNG - Buffer Overflow

NXP MCUX TRNG entropy driver in affected i.MX RT5xx and RT6xx devices contains a buffer overflow caused by improper handling of non-word-multiple byte requests in TRNG\_GetRandomData(), letting unprivileged user-mode threads or kernel callers cause memory corruption beyond the buffer, exploit requires unprivileged access to entropy device or kernel mode call.

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-2026-19736)

## Details

Type

Buffer Overflow

Impact

Data Tampering, Denial Of Service, Privilege Escalation

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

Apply the fix that aligns requests to word multiples and routes unaligned data through a safe bounce buffer; update to the fixed SDK or driver 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-2026-19736](https://nvd.nist.gov/vuln/detail/CVE-2026-19736)
- [https://github.com/zephyrproject-rtos/zephyr/commit/2c132efaf03a5d45aeaf7b0531c1107db7a36a3d](https://github.com/zephyrproject-rtos/zephyr/commit/2c132efaf03a5d45aeaf7b0531c1107db7a36a3d)
- [https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-3f6q-3949-rqph](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-3f6q-3949-rqph)

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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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