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VULNERABILITIES

CVE-2026-74521 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: kernel.orgCVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://git.kernel.org/stable/c/a386c83043015a703e227775f778e40343f45911 kernel.org
https://git.kernel.org/stable/c/ba2a5b66f1d414eb8403d655f8813783892cfc85 kernel.org
https://git.kernel.org/stable/c/d535363299822c5caa543787b21bd5cfa3e41949 kernel.org
https://git.kernel.org/stable/c/e8bb506e6ef749ac0336f3e579d8d02396b7d832 kernel.org

Weakness Enumeration

No weakness enumeration is available for this CVE.

Affected Products

No affected product data is available for this CVE.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-74521
NVD Published Date:
Aug 15, 2026
NVD Last Modified:
Sep 21, 2026
Source:
kernel.org
CVE-2026-74521 Details - Not Deferred