Okay, I found it and it is currently set thusly in master 
"kernel/kernel.config.x86_64-ipfire:CONFIG_USB_NET_CDC_NCM=m".
Does that already imply that it is enabled?

On 6/4/2024 7:20 AM, Charles Brown wrote:
> Hi Michael, I would be happy to give that shot. I did a fresh pull of 
> master into local git repo and have been grepping about looking for 
> where to enable CONFIG_USB_NET_CDC_NCM. I am a bit of a novice here at 
> this sort of thing. Could you point me where to do the enable thing 
> for this config setting? -cab
>
> On 6/3/2024 4:29 AM, Michael Tremer wrote:
>> Hello Charles,
>>
>> No, that is something that we cannot do as we would reintroduce all 
>> security vulnerabilities that have been fixed in the last 17 kernel 
>> releases.
>>
>> However, did you confirm that enabling CONFIG_USB_NET_CDC_NCM works? 
>> You mentioned this here:
>>
>>    https://bugzilla.ipfire.org/show_bug.cgi?id=13692#c2
>>
>> -Michael
>>
>>> On 2 Jun 2024, at 20:04, Charles Brown <cab_77573(a)yahoo.com> wrote:
>>>
>>> With the issue reported in Bug# 13692, would it be possible to 
>>> revert the kernel to 6.6.15 in CU 186?
>>>