From owner-freebsd-questions@FreeBSD.ORG  Wed Jul 14 13:41:02 2010
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Date: Wed, 14 Jul 2010 15:40:28 +0200
From: Bernt Hansson <bernt@bah.homeip.net>
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To: zaxis <z_axis@163.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: How can i know if the freebsd kernel need to be updated ?
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zaxis said the following on 2010-07-13 10:12:
> Now i use the following commands to maintain my freebsd box.
> 
>> portsnap fetch update
>> pkg_version -vIL=
>> portupgrade -R xxx
> 
> It works great for software installed through ports. However, how can i know
> if the kernel needs to be updated ?

You can't, unless you subscribe to announce@freebsd.org and 
security@freebsd.org