FAQ
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires an attacker to win a race condition.
MSRC compact vulnerability detail
CVE-2026-40410 · Windows SMB Client Elevation of Privilege Vulnerability
Use after free in Windows SMB Client allows an authorized attacker to elevate privileges locally.
Signals
Windows SMB Client
Elevation of Privilege
Exploited: No
Publicly disclosed: No
Exploitability: Exploitation Less Likely
CWE
Patch Diff
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Resolved binary override
Use this when the MSRC module name cannot be mapped automatically or the resolved binary looks wrong.
Description
Use after free in Windows SMB Client allows an authorized attacker to elevate privileges locally.
FAQ / Articles
FAQ
What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
Windows SMB Client Elevation of Privilege Vulnerability
Use after free in Windows SMB Client allows an authorized attacker to elevate privileges locally.