diff --git a/modules/desktop.nix b/modules/desktop.nix
index 5291afc..8185c6a 100644
--- a/modules/desktop.nix
+++ b/modules/desktop.nix
@@ -17,8 +17,11 @@
 
   # gnome-shell segfaults in touch_can_grab_surface() when a client asks for
   # a move/resize grab with the serial of a cancelled touch (NULL
-  # focus_surface). Not fixed upstream as of mutter 50.2 / main 2026-10-13.
-  # Drop once nixpkgs' mutter carries a fix.
+  # focus_surface); a mutter 50 regression from !5057. Upstream issue
+  # https://gitlab.gnome.org/GNOME/mutter/-/work_items/4871, fix in
+  # https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/5375 ("wayland/touch:
+  # Do not crash on empty focus surface"), the same NULL check as this patch.
+  # Drop once nixpkgs' mutter carries !5375.
   nixpkgs.overlays = [
     (final: prev: {
       mutter = prev.mutter.overrideAttrs (old: {
diff --git a/patches/mutter-touch-cancelled-grab.patch b/patches/mutter-touch-cancelled-grab.patch
index 687fcaf..d7a8d3f 100644
--- a/patches/mutter-touch-cancelled-grab.patch
+++ b/patches/mutter-touch-cancelled-grab.patch
@@ -14,6 +14,9 @@ touch_can_grab_surface(), which dereferences the NULL focus_surface:
   #3 xdg_toplevel_resize
 
 A cancelled touch cannot grab anything; treat it as such.
+
+Upstream: https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/5375
+(closes https://gitlab.gnome.org/GNOME/mutter/-/work_items/4871)
 ---
 --- a/src/wayland/meta-wayland-touch.c
 +++ b/src/wayland/meta-wayland-touch.c