Beware: Home windows 11-ready CPUs with VAES “prone to knowledge harm”, full CPU checklist right here

A modified red Windows 11 logo indicating a known issue

When Home windows 11 was first introduced, there was loads of annoyance surrounding it as Microsoft launched stringent system necessities for it. Solely fashionable microprocessors from AMD and Intel had been supported as they had been stated to own enhanced safety help in comparison with earlier technology CPUs, particularly Intel seventh Gen “Kaby Lake” and AMD Zen (Ryzen 1000) or older.

Nevertheless, Microsoft has discovered that there are points on the supported CPUs which include Vectorized AES (VAES) instruction. The corporate notes that such Home windows 11 and Home windows Server units are “prone to knowledge harm” because the Superior Encryption Customary (AES) instruction is supposed to speed up knowledge encryption and any bugs on this are certain to adversely impression system knowledge.

Right here is how Microsoft describes the problem:

Home windows units that help the latest Vector Superior Encryption Customary (AES) (VAES) instruction set is perhaps prone to knowledge harm. The affected Home windows units use one of many following on new {hardware}:

  • AES XEX-based tweaked-codebook mode with ciphertext stealing (AES-XTS)
  • AES with Galois/Counter Mode (GCM) (AES-GCM)

The excellent news is that Microsoft has resolved the problem by way of earlier Home windows Updates KB5014746 and KB5014019. Customers are anticipated to have efficiency impression on BitLocker, TLS, and likewise disk throughput upon putting in the workaround updates:

To forestall additional knowledge harm, we addressed this subject within the Might 24, 2022 preview launch and the June 14, 2022 safety launch. After making use of these updates, you would possibly discover slower efficiency for nearly one month after you put in them on Home windows Server 2022 and Home windows 11 (authentic launch). The situations that may have efficiency degradation embrace:

  • BitLocker
  • Transport Layer Safety (TLS) (particularly load balancers)
  • Disk throughput, particularly for enterprise prospects

It’s possible you’ll discover extra particulars on Microsoft’s official web site the place the problem is described underneath help article KB5017259.

Microsoft has not supplied an official checklist of CPUs which can be affected, so we did a little bit of digging round for our personal. The VAES instruction was launched in 2018, which implies all of the Home windows 11-supported processor fashions are actually impacted by this subject.

From deep throughout the interwebs, we found that Intel CPUs ranging from the tenth Gen Ice Lake 10nm cell chips are affected as they launched the VAES directions for the primary time with their new Sunny Cove design. This was a giant transfer from Intel because it was lastly shifting over from the 2015’s Skylake structure and its iterations. Over on the AMD aspect, the Zen 3-based Ryzen 5000 sequence desktop SKUs in addition to Ryzen 5000 cell components are hit.

Apparently, this is not the primary time that customers have confronted efficiency points with supported Home windows 11 processors. Final yr, it was revealed that Virtualization-based Safety (VBS) was inflicting a crippling impression in video games even on supported chips.

Replace: Added extra CPU households impacted by the problem:

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