I've been dubbing with management of security vulnerabilities and their fixes 
for a while, recently I discovered there may be a delay in the process of 
software updates made available on CentOS yum repository. 


take CVE-2017-5335 for example:
In redhat official notice board 
:https://access.redhat.com/security/cve/cve-2017-5335  we can see there is a 
link point to advisory for RHEL 7: 
https://access.redhat.com/errata/RHSA-2017:2292 . from there we can see that 
the fix happens at gnutls 3.3.26. 
But when trying to update with yum update from a CentOS 7.3 x64 machine. there 
is no 3.3.26 available. Only available rpm for CentOS 7.3.1611 for x86_64 is 
gnutls-3.3.24.
This result can be verified using rpm finder: 
https://www.rpmfind.net/linux/rpm2html/search.php?query=gnutls




Same problem happens to other software packages such as:
glibc
tcpdump
libnl
mariadb
...
(and many others)


Why is that? and are those software packages not going to get fixed?


- p.s. please excuse me for any formating issues.  :) 


Jeff
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