I've had this issue a couple of times over the last year or so. It just happened to me again today. For me at least, I think it's caused by something being updated in my third-party AV (ESET). I've seen this correspond to times when ESET asks for a PC reboot following a component update. Looking at my ESET Update Logs, it looks like the culprit might be ESET's Rapid Response module.
I fix it by opening the Windows Security app and navigating to "Device security> Core isolation details> Microsoft Vulnerable Driver Blocklist" and temporarily turn it OFF. Then go check for Windows Updates again. It will probably give you a couple Microsoft Defender Antivirus updates (antimalware platform & Security Intelligence Update). Then turn "Microsoft Vulnerable Driver Blocklist" back ON.
The issue should be resolved after that.
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EDIT: I forgot to mention;
If you don't ever use Microsoft Defender Antivirus scans in addition to a third party AV, you can also prevent further unnecessary Defender AV updates by doing the following:
•Open the Windows Security app, and navigate to "Virus & threat protection> Microsoft Defender Antivirus options" and turn OFF "Periodic scanning". (may need to reboot afterwards)
For some reason, that option seems to get re-enabled from time-to-time.🤷♂️