Earlier quoted context omitted.
Yeah im sure those Chinese and NK hackers are keen to document their blackmail, no way that could go badly for them
It's open source, any exploit introduced by a maintainer is self-documenting. Provide a single example for the Linux kernel, please.
1. The mechanisms for its existence exist
2. There is motivation of a large enough scale
3. The scale of the actors is large enough
The Linux kernel is very large, and nation-states like Russia are also very large. There is a very high motivation for a backdoor to exist for the Russian government. And the mechanisms are certainly in place to create such a backdoor.
So, I conclude there would absolutely be a Russian backdoor planted, if it isn't already. For the same reasons I conclude Windows probably has multiple backdoors for US agencies.
As a side-note, the scale of the Linux Kernel matters here. It's over a billion lines of code. It's truly trivial to sneak in an exploit and have it never be discovered. You can't prove a negative here - just because we haven't seen an exploit doesn't mean they don't exist. Also, we have found MANY bugs in the Linux kernel. Are they exploits intentionally planted? Virtually impossible to tell. Some bugs have existed for decades before discovery.
You should assume your operating systems already contain many exploits. Thus, we have tools like encryption, firewalls, and trusted repos to protect us anyway.
Note this doesn't mean I support the move. Certainly, any other country could implant backdoors (and probably have already). However, the Linux kernel kind of sort of belongs to the West, and the West kind of sort of has an alliance. So it makes sense why Russia is singled out.