Six Years of Red Hat Enterprise Linux 4 report (PDF) covering Feb 2005-2011 was published today.
"Red Hat knew about 51.5% of the security vulnerabilities that we fixed in advance. The average time between Red Hat knowing about an issue and it being made public was 23 days (median 10 days).... A default installation of Red Hat Enterprise Linux 4 AS was vulnerable to 20 critical security issues over the first six years. "
The data we publish is interesting to get a feel for the risk of running Enterprise Linux, but isn't really useful for comparisons with other distributions, or operating systems. One important difference is that it is Red Hat policy to count vulnerabilities and allocate CVE names to all issues that we fix, including ones that are found internally. This is not true for many other vendors including folks like Microsoft and Adobe who do not count or disclose issues they fix which were found internally.
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