CVE-2026-69530

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Use After Free in RMCAST Driver Enables Remote Code Execution

Publication date: 2026-09-08

Last updated on: 2026-09-29

Assigner: Microsoft Corporation

Description

Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-29

Generated

2026-09-29

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-69530

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_10_1809	to 10.0.17763.9245 (exc)
microsoft	windows_10_1809	to 10.0.17763.9245 (exc)
microsoft	windows_server_2025	to 10.0.26100.33438 (exc)
microsoft	windows_server_2019	to 10.0.17763.9245 (exc)
microsoft	windows_server_2022	to 10.0.20348.5622 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Executive Summary

This vulnerability is a use after free issue in the Reliable Multicast Transport Driver (RMCAST). It allows an unauthorized attacker to execute arbitrary code over a network by exploiting memory corruption after a memory location has been freed but is still accessed.

Impact Analysis

An attacker could exploit this to run malicious code on your system remotely, potentially leading to full system compromise, data theft, or installation of malware without user interaction.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR's data protection requirements and HIPAA's security rules for protected health information, potentially resulting in legal penalties and reputational damage.

Mitigation Strategies

Apply the latest security updates from Microsoft for the Reliable Multicast Transport Driver (RMCAST) as soon as possible to patch the use-after-free vulnerability.

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