Complementando... 
Possuo somente 1 usuario, e tentei liberar todas as roles que encontrei referente a este processo do cdk bootstrap
  
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "StsAccess",
            "Effect": "Allow",
            "Action": [
                "sts:AssumeRole",
                "iam:*Role*"
            ],
            "Resource": [
                "arn:aws:iam::ID:role/cdk-*"
            ]
        },
        {
            "Action": [
                "cloudformation:*"
            ],
            "Resource": [
                "arn:aws:cloudformation:sa-east-1:ID:stack/CDKToolkit/*"
            ],
            "Effect": "Allow"
        },
        {
            "Sid": "S3Access",
            "Effect": "Allow",
            "Action": [
                "s3:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Sid": "ECRAccess",
            "Effect": "Allow",
            "Action": [
                "ecr:SetRepositoryPolicy",
                "ecr:GetLifecyclePolicy",
                "ecr:PutImageScanningConfiguration",
                "ecr:DescribeRepositories",
                "ecr:CreateRepository",
                "ecr:DeleteRepository"
            ],
            "Resource": [
                "arn:aws:ecr:sa-east-1:ID:repository/cdk-*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "ssm:GetParameter*",
                "ssm:PutParameter*",
                "ssm:DeleteParameter*"
            ],
            "Resource": "arn:aws:ssm:sa-east-1:ID:parameter/cdk-bootstrap/*"
        }
    ]
}