The conventional wisdom holds that Windows is a security sieve, while Linux is locked down tight. Then why does Linux have three times the number of security holes as Windows?
A 2005 year-end vulnerability summary by US-CERT (United Stated Computer Emergency Readiness Team) concludes that Linux/Unix accounted for an eye-opening 2,328 vulnerabilities, about 45 percent of the total of 5,198 vulnerabilities for the year.
Windows, by way of contrast, had only 812 vulnerabilities during the year, 16 percent of the total.
You need to be careful interpreting these numbers, because a single vulnerability may be counted as a number of separate holes, for example.
Still, though, the report should go at least a little way toward turning the conventional wisdom on its head.
What do you think about Linux versus Windows security?