CVE-2026-19382 Almico CVE debrief

Who should care

System administrators and security teams responsible for systems using Almico Speedfan 4.52 should be aware of this weakness and take steps to mitigate potential risks. They should verify the affected systems, apply vendor patches if available, and monitor system logs for potential memory leak-related issues.

Technical summary

The weakness is located in the KiSystemCall64 function of the speedfan.sys library, which handles MSR Index operations. Local attackers can manipulate this function to cause a memory leak, potentially leading to denial-of-service conditions. The attack can only be executed locally, and the exploit has been made available to the public. The weakness may allow attackers to cause system instability or crashes. The vendor was contacted early about this disclosure but did not respond in any way. System administrators should prioritize patching affected systems to mitigate potential risks.

Defensive priority

Local attackers may exploit this weakness to cause a memory leak, potentially leading to denial-of-service conditions.

Recommended defensive actions

• Inventory affected systems and apply vendor patches if available.
• Implement compensating controls to monitor and limit local exploitation attempts.
• Monitor system logs for potential memory leak-related issues.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• 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.

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further investigation is needed to determine the full scope of the weakness. The weakness is related to the KiSystemCall64 function in the speedfan.sys library, which handles MSR Index operations. Local attackers can manipulate this function to cause a memory leak. System administrators and security teams should verify the affected systems and apply vendor patches if available. They should also monitor system logs for potential memory leak-related issues and implement compensating controls to limit local exploitation attempts.

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.