diff --git a/matrices/pre-campaign-enterprise-refresh.yaml b/matrices/pre-campaign-enterprise-refresh.yaml
index fa729c20..d3c6f3c5 100644
--- a/matrices/pre-campaign-enterprise-refresh.yaml
+++ b/matrices/pre-campaign-enterprise-refresh.yaml
@@ -1,5 +1,9 @@
 name: pre-campaign-enterprise-refresh
 profiles:
+  # The latest-kernel functional manifest requires this stable Ubuntu baseline.
+  - id: ubuntu-24.04-6.8
+    required: true
+    timeout: 20m
   - id: almalinux-9-5.14-k5.14.0-687.29.1.el9_8
     required: true
     timeout: 20m