New CPUs lead to data loss in Windows 11

Microsoft warns of data loss on devices with the latest processors and Windows 11 and Windows Server 2022.

According to Microsoft, computers and servers with the latest CPUs can experience unexpected data loss. Responsible for this is the support of the latest Vector Advanced Encryption Standard (AES, VAES), which can lead to a loss of data. The affected devices would work incorrectly when encrypting with AES-XTS and AES-GCM. How exactly this data loss could look like remains unclear in Microsoft’s warning.

Two updates should help

With two updates for Windows on May 24th and June 14th, Microsoft has already been able to contain the impending data loss. However, the fix would affect the working speed of the affected computers. Operations based on AES under Windows 11 and Windows Server 2022 would only be half as fast after the update. Microsoft also names concrete scenarios for this halved working speed. Accordingly, BitLocker, Transport Layer Security (TLS) and also write operations could work more slowly.

Which CPUs are affected

Microsoft recommends users to install the preview update for Windows 11 and Windows Server 2022 released on June 23 as soon as possible. Alternatively, the July 12 security update for Windows 11 and Windows Server 2022 can also be installed. This should prevent data loss. However, the working speed reduced by the update can be restored with the installation of the preview release update published on June 23rd. Microsoft has not announced which CPUs are specifically affected. In theory, however, all Intel processors since the 10th generation (Ice Lake) fall into the group of affected chips.

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