by Kastro CVE-2026-74521
Linux Linux — ksmbd: use memcmp() to compare ClientGUIDs
Description · from the CVE record
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.
Affected
ProductAffectedFixed inSource
Linuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 7bde6f181fa307d2cc1ec2b0313ac8e9811c82327bde6f181fa307d2cc1ec2b0313ac8e9811c8232CNA
Linuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 5a0367bf5ce420be7b19936def2e90adcf32a6835a0367bf5ce420be7b19936def2e90adcf32a683CNA
Linuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < ba2a5b66f1d414eb8403d655f8813783892cfc85ba2a5b66f1d414eb8403d655f8813783892cfc85CNA
Linuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < a386c83043015a703e227775f778e40343f45911a386c83043015a703e227775f778e40343f45911CNA
Linuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < d535363299822c5caa543787b21bd5cfa3e41949d535363299822c5caa543787b21bd5cfa3e41949CNA
Linuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < e8bb506e6ef749ac0336f3e579d8d02396b7d832e8bb506e6ef749ac0336f3e579d8d02396b7d832CNA
Linux5.15–CNA
Scores by source
Linux (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N