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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 affected < d535363299822c5caa543787b21bd5cfa3e41949
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 affected < e8bb506e6ef749ac0336f3e579d8d02396b7d832
Linux Linux affected
Version Status Constraints
5.15 affected —
0 unaffected < 5.15
7.1.8 unaffected ≤ 7.1.*
7.2-rc6 unaffected ≤ *

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References
Link Providers
https://git.kernel.org/stable/c/d535363299822c5caa543787b21bd5cfa3e41949 cve-icon cve-icon
https://git.kernel.org/stable/c/e8bb506e6ef749ac0336f3e579d8d02396b7d832 cve-icon cve-icon
History

Sat, 15 Aug 2026 15:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20

Sat, 15 Aug 2026 12:45:00 +0000

Type Values Removed Values Added
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.
Title ksmbd: use memcmp() to compare ClientGUIDs
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-15T12:27:39.330Z

Reserved: 2026-08-15T05:44:03.911Z

Link: CVE-2026-74521

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-15T13:17:57.333

Modified: 2026-08-15T13:17:57.333

Link: CVE-2026-74521

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-15T14:45:03Z

Weaknesses