Linux software provider <A HREF="http://www.eweek.com/article2/0,1895,1968373,00.asp">Red Hat issued a security advisory</A> for a number of its products, addressing a series of kernel vulnerabilities in the operating system software. The company is distributing updated kernel packages meant to fix 16 individual flaws present in the version 4.0 releases of its Red Hat Desktop and Red Hat Enterprise Linux OS software. The company advised that all Enterprise Linux 4 users should upgrade their kernels to protect themselves from the security issues, 10 of which the Red Hat Security Response Team rated as "important," and six of which it tabbed as "moderate."