Microsoft has revealed a brand new bug inside Windows 11 & Windows Server 2022 working techniques that impacts the most recent Intel & AMD CPUs. The bug is said to the encryption on the stated OS and processors outfitted with AES/VAES (Vector Advanced Encryption Standard) Instruction units have been affected.

Microsoft Confirms New Encryption Bug Could Damage Data on Latest AMD & Intel CPUs With VAES Instructions, Patch To Reduce Performance

While AMD & Intel CPUs are the highlights, nearly any system that’s working a PC with the next directions is affected and prone to knowledge injury:

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

As for the listing of CPUs which are affected by this bug, these embrace Intel CPUs beginning the tenth Gen Ice Lake and above, Ice Lake-SP Xeon Scalable processors for servers, and AMD CPUs beginning the Zen 3 lineup plus the upcoming Zen 4 chips. For Zen 3, each the non-V-Cache and 3D V-cache components are affected. Alder Lake & Raptor Lake CPUs do not formally assist VAES however it may be enabled on some motherboards with customized BIOS firmware.


  • AES-based operations is perhaps two occasions (2x) slower after putting in the Windows update for the May 24, 2022 preview launch or the June 14, 2022 safety launch.

The root explanation for this bug occurred when Microsoft added new code paths to Windows 11 and Windows Server 2022 variations of SymCrypt to benefit from the VAES directions supplied by the most recent CPUs. SymCrypt is the core cryptographic library in Windows. These directions act on Advanced Vector Extensions (AVX) registers for {hardware} with the latest supported processors.

Windows 11 Systems

However, these code paths opened up a vulnerability that might result in everlasting knowledge injury. Now there’s already a decision and workaround which is to put in the June 23, 2022 preview of the aforementioned working techniques however it’s reported by Microsoft that after making use of the brand new update, PCs will discover slower efficiency (as much as 2x slower) in functions resembling:

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

Microsoft states that customers must watch for a month for a correct patch to be rolled out however until then, the one workaround to keep away from knowledge injury is to modify to decrease efficiency on the older update.

Install the June 23, 2022 preview launch to your OS; see beneath:

  • Windows 11  (unique launch) – KB5014668
  • Windows Server 2022 – KB5014665


Install the July 12, 2022 safety launch to your OS; see beneath:

  • Windows 11  (unique launch) – KB5015814
  • Windows Server 2022 – KB5015827

through Microsoft

News Source: WindowsReport