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Vulnerabilities CVE-2026-74521

CVE-2026-74521

None
Open
TLP:CLEAR

ksmbd: use memcmp() to compare ClientGUIDs

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Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: use memcmp() to compare ClientGUIDs ClientGUID is a fixed-size binary value and can contain embedded NUL bytes. strncmp() stops comparing at the first NUL byte, so different ClientGUID values can incorrectly be treated as equal. Use memcmp() in SMB3 multichannel session binding and FSCTL_VALIDATE_NEGOTIATE_INFO to compare all SMB2_CLIENT_GUID_SIZE bytes.

Details

Confidence
90%
Published
Aug 15, 2026
Last Modified
Aug 15, 2026
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