diff --git a/cc/sanitize.go b/cc/sanitize.go
index 0b47f0e6d..66dfef57b 100644
--- a/cc/sanitize.go
+++ b/cc/sanitize.go
@@ -564,6 +564,11 @@ func (sanitize *sanitize) begin(ctx BaseModuleContext) {
 		s.Scudo = nil
 	}
 
+	if Bool(s.Undefined) || Bool(s.All_undefined) || len(s.Misc_undefined) > 0 {
+		// TODO(b/251249010): re-enable Hwaddress with UBSan once fixed.
+		s.Hwaddress = nil
+	}
+
 	if Bool(s.Hwaddress) {
 		s.Address = nil
 		s.Thread = nil