From EGIWiki
Jump to: navigation, search
Main page Software Security Checklist Issue Handling Advisories Notes On Risk Advisory Template RAT/Membership Documents Assessment Secure Coding Info for SVG members


Title:       EGI SVG Advisory [TLP:WHITE] 'High' risk - Linux kernel's IPv6 implementation - mishandled socket options [EGI-SVG-CVE-2016-3841] 

Date:        2016-12-20

Affected software and risk

'HIGH' risk vulnerability concerning Linux kernel's IPv6 implementation - mishandled socket options. 
The IPv6 stack in the Linux kernel before 4.3.3 mishandles options data, which allows local users to 
gain privileges or cause a denial of service (use-after-free and system crash) via a crafted sendmsg system call.  [R 1]

Note: only IPv6-enabled services with kernels from RedHat 7 or a derivative are affected. 
The vulnerable grid service types are the Worker Node and any shared User Interface.

Package : Linux kernel 
CVE ID  : CVE-2016-3841 

Actions required/recommended

Sites running vulnerable services on RedHat 7 or a derivative should update as soon as possible.

Sites running other versions of the Linux kernel should not be vulnerable, as the fixes were already 
in Linux versions mandated to address previous vulnerabilities.

It is not necessary for sites to respond to this e-mail.  

Affected software details

Sites should see [R 1]

More information

Sites should see [R 1] and [R 2] 



Component installation information

Sites running RedHat Linux 7 should see [R 1] 

Sites running Scientic Linux 7 should see [R 4] 


** WHITE information - Unlimited distribution 
- see for distribution restrictions***        

Minor updates may be made without re-distribution to the sites


Comments or questions should be sent to svg-rat  at

If you find or become aware of a vulnerability which is relevant to EGI you may report it by e-mail to  

report-vulnerability at
the EGI Software Vulnerability Group will take a look.  


SVG was alerted to this vulnerability by Mischa Salle.


[R 1]

[R 2]

[R 3]

[R 4]

Yyyy-mm-dd  [EGI-SVG-CVE-2016-3841]

2016-11-16 SVG alerted to this issue by Mischa Salle
2016-11--- Investigation of vulnerability and relevance to EGI carried out by SVG
2016-11-21 EGI SVG Risk Assessment completed
2016-12-14 Update available in Scientific Linux
2016-12-20 Advisory/Alert sent to sites


This advisory has been prepared as part of the effort to fulfil EGI SVG's purpose 
"To minimize the risk to the EGI infrastructure arising from software vulnerabilities"

The risk is that assessed by the group, according to the EGI SVG issue handling procedure [R 3] in the context of how the software is used in the EGI infrastructure. It is the opinion of the group, we do not guarantee it to be correct. The risk may also be higher or lower in other deployments depending on how the software is used.   

Others may re-use this information provided they:-

1) Respect the provided TLP classification

2) Credit the EGI Software Vulnerability Group 

On behalf of the EGI SVG,

Personal tools