Null Pointer Dereference in Windows SMB Server Network Transport Driver

Publication date: 2026-09-08

Last updated on: 2026-09-21

Assigner: Microsoft Corporation

Description

Null pointer dereference in Windows SMB Server Network Transport Driver (srvnet.sys) allows an unauthorized attacker to deny service over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-21

Generated

2026-09-29

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-72949

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_11_23h2	to 10.0.22631.7582 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7582 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9445 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9445 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9445 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9445 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2954 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2954 (exc)
microsoft	windows_server_2025	to 10.0.26100.33438 (exc)
microsoft	windows_server_2022	to 10.0.20348.5622 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-476	The product dereferences a pointer that it expects to be valid but is NULL.

Attack-Flow Graph

Executive Summary

This is a null pointer dereference vulnerability in the Windows SMB Server Network Transport Driver (srvnet.sys). It allows an unauthorized attacker to cause a denial of service over a network by exploiting this flaw.

Impact Analysis

An attacker could exploit this to crash the SMB server, leading to service disruption and potential loss of access to shared resources or network services.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the srvnet.sys driver. Monitor network traffic for unusual SMB activity and restrict SMB access to trusted networks only.

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