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Microsoft issued a notice warning that Windows systems equipped with processors that support the latest Vector Advanced Ecnryption Standard instruction sets may be subject to data integrity issues. The problem affects Windows 11 and Windows Server 2022. The devices affected by the problem use the AES-XTS or AES-GCM block encryption modes.
The Redmond Society indicatea risk of data loss on affected systems, without specifying what users might expect if affected by this problem. The company claimed to having solved the problem in the preview update and in the security update released on May 24 and June 14 respectively. However, these updates have a performance impact, as AES-based operations may be twice as slow on Windows Server 2022 and Windows 11 systems.
Microsoft recommends applying these updates to “prevent further damage”. The company also warns that the subsequent installation of the June 23 preview update or the July 12 security update fixes the performance issues. The main scenarios in which performance degradation can occur areBitLocker, the TLS protocol and disk operations (in particular for the enterprise areas “.
The Redmond company does not provide a list of the processors involved, but the VAES instruction sets are supported starting from the architecturesIntel Ice Lake And AMD Zen 3 or, in other words, all processors launched on the market since 2019 (Intel) and 2020 (AMD).
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