---
id: CVE-2026-6924
title: >-
  A bug in the entropy initialization for SiWx917 causes the DRBG to use a
  predictable seed
summary: >-
  A bug in the entropy initialization for SiWx917 causes the DRBG to use a
  predictable seed. As such, all random numbers generated in the Matter code use
  the same stream of numbers. This vulnerability was discovered after the
  impacted repo…
severity: none
cwe:
  - CWE-336
published: '2026-07-23'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:12:59.557'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-6924'
references:
  - url: 'https://github.com/SiliconLabs/matter/tree/release_2.3.1-1.3'
    label: product-security@silabs.com
  - url: >-
      https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/a45Vm0000009SzZIAU?operationContext=S1
    label: product-security@silabs.com
tags:
  - nvd
epss: 0.00445
epssPercentile: 0.38088
ingestedAt: '2026-09-08T20:10:03.154Z'
---

## Overview

A bug in the entropy initialization for SiWx917 causes the DRBG to use a predictable seed. As such, all random numbers generated in the Matter code use the same stream of numbers. This vulnerability was discovered after the impacted repository was already deprecated.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.