Windows 10 · Release · Security update (Patch Tuesday)

January 3, 2018—KB4056893 (OS Build 10240.17738)

Microsoft's known issues — KB4056893

  • Issue Known issue When calling CoInitializeSecurity, the call will fail if passing RPC_C_IMP_LEVEL_NONE under certain conditions. When calling CoInitializeSecurity, the call may fail when passing RPC_C_AUTHN_LEVEL_NONE as the authentication level. The error returned on failure is STATUS_BAD_IMPERSONATION_LEVEL. Workaround: This issue is resolved in KB 4075199 .
  • Issue Known issue Microsoft has reports of some customers on a small subset of older AMD processors getting into an unbootable state after installing this KB. To prevent this issue, Microsoft will temporarily pause Windows OS updates to devices with impacted AMD processors at this time. Workaround: This issue is resolved in KB 4075199 .
  • Issue Known issue Because of an issue that affects some versions of antivirus software, this fix applies only to computers on which the antivirus ISV updated the ALLOW REGKEY. Workaround: This issue is resolved in KB4088786 .
  • Issue Known issue After installing this update, some users may experience issues logging into some websites when using third-party account credentials in Microsoft Edge. Workaround: This issue is resolved in KB4074596 .

Microsoft's release notes for KB4056893 ›

Known issues — reported on the forum

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In the news

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