I’m not sure where to report this, but as I suspected, there seems to be something wrong with the latest update in the NVT feed.
I searched the feed directories for the troublesome OID (1.3.6.1.4.1.25623.1.0.150081) and found it only in 4 files in
/usr/local/var/lib/gvm/data-objects/gvmd/20.08/configs :
policy-gaussdbkernel-2eec8313-fee4-442a-b3c4-fa0d5dc83d61.xml
policy-opengauss-c2b049f9-6d3d-45be-871f-2252895ed9e8.xml
policy_euleros_20200909_9f822ad3-9208-4e02-ac03-78dce3ca9a23.xml
policy_gaussdb_20200909_61327f09-8a54-4854-9e1c-16798285fb28.xml
I first edited these xml files and removed the sections with the troublesome OID, and the errors were gone.
The removed sections appear as:
<preference>
<nvt oid="1.3.6.1.4.1.25623.1.0.150081">
<name>Linux: SSH AllowGroups</name>
</nvt>
<name>Value</name>
<type>entry</type>
<value/>
<default>group1 group2</default>
<id>1</id>
</preference>
OR
<nvt_selector>
<include>1</include>
<type>2</type>
<family_or_nvt>1.3.6.1.4.1.25623.1.0.150081</family_or_nvt>
</nvt_selector>
While editing, I realized that 2 of the 4 had 2 references to the OID, and the other 2 did not. The second reference was regarding the family. I added family reference and viola!!
So … It’s a feed problem.