What is CVE-2026-64138?

CVE-2026-64138 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. ksmbd: validate SID in parent security descriptor during ACL inheritance

Which CVE IDs does CVE-2026-64138 cover?

CVE-2026-64138 covers the following CVE IDs: CVE-2026-64138. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-64138?

CVE-2026-64138 has a CVSS v3 base score of 9.8, published by Microsoft Security Response Center (MSRC).

CVE-2026-64138CriticalCVSS 9.8

ksmbd: validate SID in parent security descriptor during ACL inheritance

Vendor

Microsoft Security Response Center (MSRC)

Published

July 23, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-64138 →