CVE-2026-64138

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the ksmbd module where the Owner SID and Group SID within the NT Security Descriptor (smb ntsd) retrieved from the parent directory are not properly validated during ACL inheritance. To address this, the smb validate ntsd sid() helper function was introduced to ensure these SIDs are safely validated.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.