Summary
Impact: Information Disclosure. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
What type of information could be disclosed by this vulnerability?
Exploiting this vulnerability could allow the disclosure of certain kernel memory content.
Security updates
10.0.17763.8755 — https://support.microsoft.com/help/5087538
10.0.20348.5139 — https://support.microsoft.com/help/5087545
10.0.20348.5074 — https://support.microsoft.com/help/5087424
10.0.19044.7291 — https://support.microsoft.com/help/5087544
10.0.19045.7417 — https://support.microsoft.com/help/5094127
10.0.26100.32860 — https://support.microsoft.com/help/5087539
10.0.26100.32772 — https://support.microsoft.com/help/5087423
10.0.26200.8457 — https://support.microsoft.com/help/5089549
10.0.26200.8390 — https://support.microsoft.com/help/5089466
10.0.22631.7079 — https://support.microsoft.com/help/5087420
10.0.22631.7219 — https://support.microsoft.com/help/5093998
10.0.25398.2330 — https://support.microsoft.com/help/5087541
10.0.28000.2113 — https://support.microsoft.com/help/5089548
10.0.14393.9140 — https://support.microsoft.com/help/5087537
6.2.9200.26079 — https://support.microsoft.com/help/5087470
6.3.9600.23181 — https://support.microsoft.com/help/5087471
Vulnerabilities 1
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High 7.5
Windows TCP/IP Information Disclosure Vulnerability
Use after free in Windows TCP/IP allows an unauthorized attacker to disclose information over a network.
Revision history
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#1
Information published.
References
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CVE-2026-40406 Windows TCP/IP Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40406
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss