CVE-2026-6924 Silicon Labs CVE debrief

Who should care

Defenders responsible for Matter code deployments and SiWx917 integrations should assess exposure and verify affected versions. Operators of Matter code deployments, platform administrators, and security teams should review the vulnerability and its potential impact on their systems. They should also consider compensating controls for random number generation and assess exposure in Matter code deployments.

Why it matters

CVE-2026-6924 affects Matter code deployments using SiWx917 due to a predictable seed in entropy initialization, requiring verification of affected versions and assessment of exposure.

• Verification of affected versions is required to determine exposure
• Compensating controls for random number generation may be necessary
• Assessing exposure in Matter code deployments is crucial

Technical summary

The SiWx917 entropy initialization bug causes the DRBG to use a predictable seed, resulting in the same stream of random numbers being generated in the Matter code. This affects Matter code deployments using SiWx917, requiring verification of affected versions and assessment of exposure. The vulnerability has a high CVSS score of 8.7 and was discovered after the impacted repository was deprecated. Defenders should prioritize verifying the affected versions and assessing exposure in their Matter code deployments. The official CVE Program record and NVD detail page offer source-provided CVE metadata and vulnerability assessment.

Defensive priority

Defenders should prioritize verifying the affected versions and assessing exposure in their Matter code deployments.

Recommended defensive actions

• Verify affected versions of the Matter code and SiWx917
• Assess exposure in Matter code deployments
• Consider compensating controls for random number generation
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but the impacted repository was deprecated before the discovery. The CVE record was published on 2026-07-23T21:17:05.447Z and has not been modified since then. The official CVE Program record and NVD detail page offer source-provided CVE metadata and vulnerability assessment. The impacted repository was deprecated before the discovery of the vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.