A vulnerability in the Linux kernel's ksmbd component involves the FS_POSIX_INFORMATION structure where the FileSysIdentifier field is not properly assigned in smb2_get_info_filesystem(). This can cause residual data from previous responses to be leaked to clients during compound SMB2 requests. The issue arises because the response buffer is reused without clearing the FileSysIdentifier field, potentially exposing unintended data. The fix involves correctly reporting the file system ID as returned by statfs().