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Title:       EGI SVG 'ADVISORY' [TLP:WHITE] CRITICAL risk polkit vulnerability - RHEL/CentOS 8 and derivatives CVE-2021-3560 [EGI-SVG-CVE-2021-3560]   

Date:        2021-06-16
Updated:     2021-06-30  Changed to [TLP:WHITE] and placed on the wiki. 

Affected software and risk

CRITICAL risk vulnerability concerning polkit version in RedHat Enterprise 8 and its derivatives 

Package : polkit
CVE ID  : CVE-2021-3560

A local privilege escalation vulnerability has been found in polkit versions used in Red Hat Enterprise Linux 8 
and its derivatives. [R 1] [R 2].  This was fixed by RedHat in a release from 3rd June 2021.  

Actions required/recommended

Sites running RHEL 8 and its derivatives are required to urgently install a patched version, if they have not done so already.   

All running resources MUST be either patched or have mitigation
in place or software removed by 2021-06-23  00:00 UTC

Sites failing to act and/or failing to respond to requests from the EGI CSIRT team risk site suspension. 

Component installation information

Sites running RHEL 8 should see [R 2]

Sites running CentOS8 should also see [R 2]

Sites running Debian should see [R 3] 

Sites running Ubuntu should see [R 4]

Affected software details

RHEL 8 and its derivatives are affected.

RHEL 7 and its derivatives do not appear to be affected.


** WHITE information - Limited 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 another 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 according to the procedure defined in [R 5]  

Note that this is undergoing revision to fully handle vulnerabilities in the EOSC-hub era. 


[R 1]

[R 2]

[R 3]

[R 4]

[R 5]


SVG was alerted to this vulnerability by Barbara Krasovec who is a member of the EGI SVG

Yyyy-mm-dd  [EGI-SVG-2021-CVE-2021-3560] 

2021-06-14 SVG alerted to this issue by Barbara Krasovec
2021-06-03 Fixed version available from RedHat
2021-06-15 EGI SVG Risk Assessment completed
2021-06-16 Advisory 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 5]  
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

Note that the SVG issue handling procedure is currently under review, to take account of the increasing inhomogeneity 
of the EGI infrastructure and the services in the EOSC-hub catalogue.

On behalf of the EGI SVG,