CVE-2026-42915 Details
Description
Incorrect calculation of buffer size in Windows VMSwitch allows an authorized attacker to deny service locally.
A denial-of-service vulnerability has been identified in the TCP/IP stack of Microsoft Windows. This issue arises from an incorrect calculation of buffer sizes, which allows an authorized attacker to disrupt services over an adjacent network. The vulnerability affects multiple Windows products and versions, including various editions of Windows 10, Windows 11, Windows Server 2022, and Windows Server 2025.
Users can apply the security update provided by Microsoft to address this vulnerability. This security update is available through the Microsoft Update Catalog. Specific update details can be found in the Microsoft Knowledge Base articles KB5094125, KB5094126, KB5094127, KB5094128, and KB5095051.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 10, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42915 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-131 | Incorrect Calculation of Buffer Size | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft windows 10 21h2 | < 10.0.19044.7417 |
CPE
Remediation
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| microsoft windows 10 22h2 | < 10.0.19045.7417 |
CPE
Remediation
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| microsoft windows 11 23h2 | < 10.0.22631.7219 |
CPE
Remediation
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| microsoft windows 11 24h2 | < 10.0.26100.8655 |
CPE
Remediation
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| microsoft windows 11 25h2 | < 10.0.26200.8655 |
CPE
Remediation
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| microsoft windows 11 26h1 | < 10.0.28000.2269 |
CPE
Remediation
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| microsoft windows server 2022 | < 10.0.20348.5256 |
CPE
Remediation
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| microsoft windows server 2025 | < 10.0.26100.32995 |
CPE
Remediation
| |
Change History
7 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 19, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 16, 2026 | CVE Modified | [email protected] |
| Jun 11, 2026 | Initial Analysis | [email protected] |
| Jun 9, 2026 | New CVE Received | [email protected] |