{"cve":"CVE-2026-74521","nvd":{"published":"2026-08-15T13:17:57.333","modified":"2026-10-03T11:17:39.133","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: use memcmp() to compare ClientGUIDs\n\nClientGUID is a fixed-size binary value and can contain embedded NUL\nbytes. strncmp() stops comparing at the first NUL byte, so different\nClientGUID values can incorrectly be treated as equal.\n\nUse memcmp() in SMB3 multichannel session binding and\nFSCTL_VALIDATE_NEGOTIATE_INFO to compare all SMB2_CLIENT_GUID_SIZE\nbytes.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":[],"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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:49:10.689564601+00:00"},"epss":{"cve":"CVE-2026-74521","score":0.00406,"percentile":0.34598,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}