EGI SVG Advisories


         Privilege escalation vulnerability in the linux 
         kernel 5.4 - RHEL 8 and derivatives
Date:        2022-03-16
Updated:     2022-07-28

Affected software and risk

CRITICAL Risk vulnerability concerning the linux kernel

Package    : Linux kernel 
CVE ID     : CVE-2022-25636
Bug ID     : 
CVSS Score : 7.8 [R 1]

An out-of-bounds (OOB) memory access flaw was found which allows a local 
attacker with a user account on the system to gain access to out-of-bounds 
memory, leading to a system crash or a privilege escalation threat. 
[R 1] , [R 2], [R 3].

A working exploit is available publicly. 

Note that this only affects RHEL 8 and its derivatives.  
It does not affect RHEL 7 and its derivatives. 

Actions required/recommended

**UPDATE 2022-07-28**

Sites which have not already done so should update as soon as possible.
Patches are available for RHEL 8 and derivatives.

Component installation information

Sites running RHEL 8 should see [R 1]

Sites running Ubuntu should see [R 4]

Sites running Debian should see [R 5]

Sites running RockyLinux should see [R 6]

Sites running AlmaLinux should see [R 7]


Sites which do NOT run Linux containers are strongly recommended to 
disable unprivileged user namespaces as described in [R 1]

Affected software details

This vulnerability affects Linux kernel 5.4+

RHEL version 7 and derivatives are not affected.

RHEL version 8 and derivatives are affected.

More information

This advisory is being updated as there is a fix for RHEL 8 and derivatives.


** 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 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 99]


[R 1] 

[R 2]

[R 3]

[R 4] 

[R 5]  

[R 6] RockyLinux 

[R 7] AlmaLinux 

[R 99]


SVG was alerted to this vulnerability by Pinja Koskinen

Yyyy-mm-dd  [EGI-SVG-CVE-2022-25636] 

2022-02-23 SVG alerted to this issue by Pinja Koskinen
2022-02-23 Acknowledgement from the EGI SVG to the reporter
2022-03-16 Re-looked at Risk as exploit available and some taking urgent action 
2022-03-16 EGI SVG Risk Assessment completed
2022-03-17 Advisory sent to sites
2022-07-28 Advisory updated, to mention fixed for RHEL 8 and derivatives


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
The risk is that assessed by the group, according to the EGI SVG issue handling
procedure [R 99] 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.
This advisory is subject to the Creative commons licence 
and the EGI Software Vulnerability Group must be credited. 
On behalf of the EGI SVG,