diff --git a/blocked-edges/4.12.0-rc.0-AWSOldBootImage.yaml b/blocked-edges/4.12.0-rc.0-AWSOldBootImage.yaml
new file mode 100644
index 000000000..25a93e901
--- /dev/null
+++ b/blocked-edges/4.12.0-rc.0-AWSOldBootImage.yaml
@@ -0,0 +1,21 @@
+to: 4.12.0-rc.0
+from: 4[.]11[.].*
+url: https://issues.redhat.com/browse/COS-1942
+name: AWSOldBootImages
+message: |-
+  4.2 AWS boot images are not compatible with 4.12.0-rc.0, and machines created with them will fail to become nodes.  This risk does not apply if a cluster is not on AWS, was installed as version 4.3 or later, or otherwise uses 4.3 or later boot images.
+matchingRules:
+- type: PromQL
+  promql:
+    promql:
+      topk(1,
+        label_replace(group(cluster_version{type="initial",version=~"4[.][0-9][.].*"}),"born_by_4_9", "yes, so possibly actually born in 4.1 or 4.2", "", "")
+        or
+        label_replace(0 * group(cluster_version{type="initial",version!~"4[.][0-9][.].*"}),"born_by_4_9", "no, born in 4.10 or later", "", "")
+      )
+      * on () group_left (type)
+      (
+        cluster_infrastructure_provider{type="AWS"}
+        or
+        0 * cluster_infrastructure_provider
+      )
diff --git a/blocked-edges/4.12.0-rc.1-AWSOldBootImage.yaml b/blocked-edges/4.12.0-rc.1-AWSOldBootImage.yaml
new file mode 100644
index 000000000..8e082eca9
--- /dev/null
+++ b/blocked-edges/4.12.0-rc.1-AWSOldBootImage.yaml
@@ -0,0 +1,21 @@
+to: 4.12.0-rc.1
+from: 4[.]11[.].*
+url: https://issues.redhat.com/browse/COS-1942
+name: AWSOldBootImages
+message: |-
+  4.2 AWS boot images are not compatible with 4.12.0-rc.1, and machines created with them will fail to become nodes.  This risk does not apply if a cluster is not on AWS, was installed as version 4.3 or later, or otherwise uses 4.3 or later boot images.
+matchingRules:
+- type: PromQL
+  promql:
+    promql:
+      topk(1,
+        label_replace(group(cluster_version{type="initial",version=~"4[.][0-9][.].*"}),"born_by_4_9", "yes, so possibly actually born in 4.1 or 4.2", "", "")
+        or
+        label_replace(0 * group(cluster_version{type="initial",version!~"4[.][0-9][.].*"}),"born_by_4_9", "no, born in 4.10 or later", "", "")
+      )
+      * on () group_left (type)
+      (
+        cluster_infrastructure_provider{type="AWS"}
+        or
+        0 * cluster_infrastructure_provider
+      )
diff --git a/blocked-edges/4.12.0-rc.2-AWSOldBootImage.yaml b/blocked-edges/4.12.0-rc.2-AWSOldBootImage.yaml
new file mode 100644
index 000000000..f83ba966d
--- /dev/null
+++ b/blocked-edges/4.12.0-rc.2-AWSOldBootImage.yaml
@@ -0,0 +1,21 @@
+to: 4.12.0-rc.2
+from: 4[.]11[.].*
+url: https://issues.redhat.com/browse/COS-1942
+name: AWSOldBootImages
+message: |-
+  4.2 AWS boot images are not compatible with 4.12.0-rc.2, and machines created with them will fail to become nodes.  This risk does not apply if a cluster is not on AWS, was installed as version 4.3 or later, or otherwise uses 4.3 or later boot images.
+matchingRules:
+- type: PromQL
+  promql:
+    promql:
+      topk(1,
+        label_replace(group(cluster_version{type="initial",version=~"4[.][0-9][.].*"}),"born_by_4_9", "yes, so possibly actually born in 4.1 or 4.2", "", "")
+        or
+        label_replace(0 * group(cluster_version{type="initial",version!~"4[.][0-9][.].*"}),"born_by_4_9", "no, born in 4.10 or later", "", "")
+      )
+      * on () group_left (type)
+      (
+        cluster_infrastructure_provider{type="AWS"}
+        or
+        0 * cluster_infrastructure_provider
+      )
diff --git a/blocked-edges/4.12.0-rc.3-AWSOldBootImage.yaml b/blocked-edges/4.12.0-rc.3-AWSOldBootImage.yaml
new file mode 100644
index 000000000..b1e784e1d
--- /dev/null
+++ b/blocked-edges/4.12.0-rc.3-AWSOldBootImage.yaml
@@ -0,0 +1,21 @@
+to: 4.12.0-rc.3
+from: 4[.]11[.].*
+url: https://issues.redhat.com/browse/COS-1942
+name: AWSOldBootImages
+message: |-
+  4.2 AWS boot images are not compatible with 4.12.0-rc.3, and machines created with them will fail to become nodes.  This risk does not apply if a cluster is not on AWS, was installed as version 4.3 or later, or otherwise uses 4.3 or later boot images.
+matchingRules:
+- type: PromQL
+  promql:
+    promql:
+      topk(1,
+        label_replace(group(cluster_version{type="initial",version=~"4[.][0-9][.].*"}),"born_by_4_9", "yes, so possibly actually born in 4.1 or 4.2", "", "")
+        or
+        label_replace(0 * group(cluster_version{type="initial",version!~"4[.][0-9][.].*"}),"born_by_4_9", "no, born in 4.10 or later", "", "")
+      )
+      * on () group_left (type)
+      (
+        cluster_infrastructure_provider{type="AWS"}
+        or
+        0 * cluster_infrastructure_provider
+      )
diff --git a/blocked-edges/4.12.0-rc.4-AWSOldBootImage.yaml b/blocked-edges/4.12.0-rc.4-AWSOldBootImage.yaml
new file mode 100644
index 000000000..3896f4a68
--- /dev/null
+++ b/blocked-edges/4.12.0-rc.4-AWSOldBootImage.yaml
@@ -0,0 +1,21 @@
+to: 4.12.0-rc.4
+from: 4[.]11[.].*
+url: https://issues.redhat.com/browse/COS-1942
+name: AWSOldBootImages
+message: |-
+  4.2 AWS boot images are not compatible with 4.12.0-rc.4, and machines created with them will fail to become nodes.  This risk does not apply if a cluster is not on AWS, was installed as version 4.3 or later, or otherwise uses 4.3 or later boot images.
+matchingRules:
+- type: PromQL
+  promql:
+    promql:
+      topk(1,
+        label_replace(group(cluster_version{type="initial",version=~"4[.][0-9][.].*"}),"born_by_4_9", "yes, so possibly actually born in 4.1 or 4.2", "", "")
+        or
+        label_replace(0 * group(cluster_version{type="initial",version!~"4[.][0-9][.].*"}),"born_by_4_9", "no, born in 4.10 or later", "", "")
+      )
+      * on () group_left (type)
+      (
+        cluster_infrastructure_provider{type="AWS"}
+        or
+        0 * cluster_infrastructure_provider
+      )
diff --git a/blocked-edges/4.12.0-rc.5-AWSOldBootImage.yaml b/blocked-edges/4.12.0-rc.5-AWSOldBootImage.yaml
new file mode 100644
index 000000000..37db6e308
--- /dev/null
+++ b/blocked-edges/4.12.0-rc.5-AWSOldBootImage.yaml
@@ -0,0 +1,21 @@
+to: 4.12.0-rc.5
+from: 4[.]11[.].*
+url: https://issues.redhat.com/browse/COS-1942
+name: AWSOldBootImages
+message: |-
+  4.2 AWS boot images are not compatible with 4.12.0-rc.5, and machines created with them will fail to become nodes.  This risk does not apply if a cluster is not on AWS, was installed as version 4.3 or later, or otherwise uses 4.3 or later boot images.
+matchingRules:
+- type: PromQL
+  promql:
+    promql:
+      topk(1,
+        label_replace(group(cluster_version{type="initial",version=~"4[.][0-9][.].*"}),"born_by_4_9", "yes, so possibly actually born in 4.1 or 4.2", "", "")
+        or
+        label_replace(0 * group(cluster_version{type="initial",version!~"4[.][0-9][.].*"}),"born_by_4_9", "no, born in 4.10 or later", "", "")
+      )
+      * on () group_left (type)
+      (
+        cluster_infrastructure_provider{type="AWS"}
+        or
+        0 * cluster_infrastructure_provider
+      )