> ...has a scan on a Linux kernel reported the uptime?

From

 http://www.insecure.org/nmap/nmap-fingerprinting-article.html


TCP Timestamp -- Another number that can be sequenced for OS detection
    purposes is the TCP timestamp option values.  Some systems do not
    support the feature, others increment the value at frequencies of
    2HZ, 100HZ, or 1000HZ, and still others return 0.  Nmap also uses
    this information to determine uptime values for the remote host.


so perhaps it has figured it out....

dave

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