Security Advisory - release version, user or kernel patch level?

[zhaghzhagh at openmailbox.org]

Good morning

Every now and then I get confused by the version number of security 
patches.

For example:

https://www.freebsd.org/security/advisories/FreeBSD-SA-17:02.openssl.asc:

...
Corrected:      2017-01-26 19:14:14 UTC (stable/11, 11.0-STABLE)
                 2017-02-23 07:11:48 UTC (releng/11.0, 11.0-RELEASE-p8)
                 2017-01-27 07:45:06 UTC (stable/10, 10.3-STABLE)
                 2017-02-23 07:12:18 UTC (releng/10.3, 10.3-RELEASE-p17)
...

[user at domain ~]$ uname -a
FreeBSD domain.tld 10.3-RELEASE-p11 FreeBSD 10.3-RELEASE-p11 #0: Mon Oct 
24 18:47:18 UTC 2016     
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  i386

Guesses:

1. 'uname' - 'p11' = kernel patch level (?)
2. '10.3-RELEASE-p17' - 'p17' = user patch level (?)

What if there is a security patch that affects only kernel?

Is it safe in all times to use 'freebsd-version -u' to decide whether my 
host needs to be updated, upon a security notification is issued? (Don't 
want to run 'freebsd-update' unnecessarily.)


Thanks!