Microsoft just released several updates aimed at helping protect Surface devices from the two security vulnerabilities exposed by CPU bugs.
Unless the antivirus vendor has set a Windows registry key that provides compatibility with the update, users of the affected Windows platform will not be protected by the security updates.
Linux kernel creator Linus Torvalds said mitigations would have at least a five percent hit on performance, but that actual impact would depend on the workload.
AMD chips aren't vulnerable to the Meltdown attack, but operating system updates could address one of the Spectre attacks it was vulnerable to.
This is our new weekly column that rounds up all the latest news from the Microsoft campus and throws it on a page with a bit of observation and commentary. Microsoft was quick to issue emergency patches, but some hardware operating system combinations are proving to be problematic for some users who followed the urgent recommendations of cyber-security experts and updated their systems before Meltdown and Spectre attacks surface and cause serious data breaches.
"Microsoft has been working closely with antivirus software partners to ensure all customers receive the January Windows security updates as soon as possible". We'll update this post with more information if and when it's available.
But that registry requirement doesn't appear to be causing the problem with AMD processors, as some users report that they have compatible anti-virus software running.
Some users are reporting that their older AMD based PCs with Athlon processors will no longer boot into Windows after installing the latest KB4056892 security patch.
If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.
The advice to users is to make sure your device is kept up to date and install any security or software updates that are released over the coming days.
AMD's CPUs may have been immune to Meltdown and Spectre, but it turns out they are not immune to Microsoft's patch for the same.