nixos/apparmor: load bpf last unconditionally

nixos/modules/security/default.nix

@@ -1,4 +1,8 @@
-{ config, lib, ... }:
+{
+  config,
+  lib,
+  ...
+}:
 let
   cfg = config.security;
 in
@@ -16,10 +20,16 @@ in
   config = lib.mkMerge [
     {
       # We set the default LSM's here due to them not being present if set when enabling AppArmor.
-      security.lsm = [
-        "landlock"
-        "yama"
-        "bpf"
+      security.lsm = lib.mkMerge [
+        [
+          "landlock"
+          "yama"
+        ]
+        # Load BPF last unconditionally. See: https://github.com/NixOS/nixpkgs/pull/533428.
+        # Apparmor (and potentially other modules) will load incorrectly if they are not before BPF.
+        # It is believed that there was a regression between kernel 6.12 and 6.18 which caused the
+        # passthrough stub or LSM stacking of the BPF module to interact with other modules incorrectly.
+        (lib.mkAfter [ "bpf" ])
       ];
     }
     (lib.mkIf (lib.lists.length cfg.lsm > 0) {