Revert kernel updates for 2026-02-26 (#494816)

pkgs/applications/virtualization/qemu/default.nix

@@ -88,6 +88,8 @@
   tpmSupport ? !minimal,
   uringSupport ? stdenv.hostPlatform.isLinux && !userOnly,
   liburing,
+  fuseSupport ? stdenv.hostPlatform.isLinux && !minimal,
+  fuse3,
   canokeySupport ? false,
   canokey-qemu,
   capstoneSupport ? !minimal,
@@ -241,6 +243,7 @@ stdenv.mkDerivation (finalAttrs: {
   ++ lib.optionals libiscsiSupport [ libiscsi ]
   ++ lib.optionals smbdSupport [ samba ]
   ++ lib.optionals uringSupport [ liburing ]
+  ++ lib.optionals fuseSupport [ fuse3 ]
   ++ lib.optionals canokeySupport [ canokey-qemu ]
   ++ lib.optionals capstoneSupport [ capstone ]
   ++ lib.optionals valgrindSupport [ valgrind-light ];
@@ -324,6 +327,7 @@ stdenv.mkDerivation (finalAttrs: {
   ++ lib.optional libiscsiSupport "--enable-libiscsi"
   ++ lib.optional smbdSupport "--smbd=${samba}/bin/smbd"
   ++ lib.optional uringSupport "--enable-linux-io-uring"
+  ++ lib.optional fuseSupport "--enable-fuse"
   ++ lib.optional canokeySupport "--enable-canokey"
   ++ lib.optional capstoneSupport "--enable-capstone"
   ++ lib.optional (!pluginsSupport) "--disable-plugins"

pkgs/os-specific/linux/kernel/kernels-org.json

@@ -30,13 +30,13 @@
         "lts": true
     },
     "6.18": {
-        "version": "6.18.14",
-        "hash": "sha256:1f3wv9vdg43cy1lnqd60zqgki6px67mdhfkfnpk1npqq5akk86cd",
-        "lts": true
+        "version": "6.18.13",
+        "hash": "sha256:0zv8qml075jpk2i58cxp61hm3yb74mpkbkjg15n87riqzmakqb7d",
+        "lts": false
     },
     "6.19": {
-        "version": "6.19.4",
-        "hash": "sha256:1b68i7z91fbs1zayzzzf71g9ilfk0wi2fr8nralha60xq723p6r7",
+        "version": "6.19.3",
+        "hash": "sha256:1glf369wfr66lmv9wmijin6idlfgijfsh0gx2qly7gpwmml4jiqf",
         "lts": false
     }
 }