Information
This policy setting specifies whether SharedArrayBuffers can be used in a non-cross-origin-isolated context. A SharedArrayBuffer is a binary data buffer that can be used to create views on shared memory. SharedArrayBuffers have a memory access vulnerability in several popular CPUs.
The recommended state for this setting is: Disabled.
Rationale:
Disabling this policy prevents attackers from being able to exploit memory access vulnerabilities found in popular CPUs.
Impact:
Users may experience slightly slower loading of webpages.
Solution
To establish the recommended configuration via GP, set the following UI path to Disabled:
Computer Configuration\Policies\Administrative Templates\Microsoft Edge\Specifies whether SharedArrayBuffers can be used in a non cross-origin-isolated context
Note: This Group Policy path may not exist by default. It is provided by the Group Policy template MSEdge.admx/adml that can be downloaded from: Download Microsoft Edge for Business - Microsoft.
Default Value:
Enabled. (Sites are allowed to use SharedArrayBuffers.)