What happened
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 versions
Linux: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 through before 7bde6f181fa307d2cc1ec2b0313ac8e9811c8232 (git); e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 through before 5a0367bf5ce420be7b19936def2e90adcf32a683 (git); e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 through before ba2a5b66f1d414eb8403d655f8813783892cfc85 (git); e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 through before a386c83043015a703e227775f778e40343f45911 (git); e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 through before d535363299822c5caa543787b21bd5cfa3e41949 (git); e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 through before e8bb506e6ef749ac0336f3e579d8d02396b7d832 (git); 5.15 Fixed: See vendor advisory.
Why it matters
Review the vendor advisory and exposure of the affected product to determine operational impact.
Detection & mitigation
- Apply vendor-provided updates or mitigations.
- Review affected product exposure and access logs.
Public PoC references
No public PoC reference has passed the current publication threshold.