CVE-2026-74521

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.

CVSS 3.1

9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 34% of CVEs (scores of 2026-10-25)

Published

2026-08-15

Modified

2026-10-03

Record from

the NVD, synced 2026-10-19

References

• https://git.kernel.org/stable/c/5a0367bf5ce420be7b19936def2e90adcf32a683
• https://git.kernel.org/stable/c/7bde6f181fa307d2cc1ec2b0313ac8e9811c8232
• https://git.kernel.org/stable/c/a386c83043015a703e227775f778e40343f45911
• https://git.kernel.org/stable/c/ba2a5b66f1d414eb8403d655f8813783892cfc85
• https://git.kernel.org/stable/c/d535363299822c5caa543787b21bd5cfa3e41949

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