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Yesterday we started notifying some of our customers of a timely security and operational update we need to perform on a small percentage (less than 10%) of our EC2 fleet globally.
AWS customers know that security and operational excellence are our top two priorities. These updates must be completed by October 1st before the issue is made public as part of an upcoming Xen Security Announcement (XSA). Following security best practices, the details of this update are embargoed until then. The issue in that notice affects many Xen environments, and is not specific to AWS.
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