Valve announced a change for Steam today that will make things a lot clearer for everyone, as developers will now need to clearly list the kernel-level anti-cheat used on Steam store pages.
Now if only they could more clearly communicate when games are playable offline.
any software intentionally designed to cause disruption to a computer, server, client, or computer network, leak private information, gain unauthorized access to information or systems, deprive access to information, or which unknowingly interferes with the user’s computer security and privacy
It does not do any of these things. Like any software, it may have vulnerabilities, and being a kernel module it can be high risk. But that’s no different from any kernel module, like your graphics driver.
Wikipedia says malware is
It does not do any of these things. Like any software, it may have vulnerabilities, and being a kernel module it can be high risk. But that’s no different from any kernel module, like your graphics driver.