diff --git a/pkgs/development/python-modules/vllm/default.nix b/pkgs/development/python-modules/vllm/default.nix
index d710af5d7a93..ca759392b585 100644
--- a/pkgs/development/python-modules/vllm/default.nix
+++ b/pkgs/development/python-modules/vllm/default.nix
@@ -104,6 +104,20 @@ let
     hash = "sha256-HJY+Go1viPkSVZPEs/NyMtYJzas4mMLiIZF3kNX+WgA=";
   };
 
+  # FlashMLA's Blackwell (SM100) kernels were developed against CUTLASS v3.9.0
+  # (since https://github.com/vllm-project/FlashMLA/commit/9c5dfab6d1746b4a27af14f440e7afd5c01ece68)
+  # and are currently incompatible with CUTLASS v4.x APIs. The rest of the vLLM
+  # build uses a newer CUTLASS, so we package both versions.
+  # See upstream issue: https://github.com/vllm-project/vllm/issues/27425
+  # See git submodule commit at:
+  # https://github.com/vllm-project/FlashMLA/tree/${flashmla.src.rev}/csrc
+  cutlass-flashmla = fetchFromGitHub {
+    owner = "NVIDIA";
+    repo = "cutlass";
+    tag = "v3.9.0";
+    hash = "sha256-Q6y/Z6vahASeSsfxvZDwbMFHGx8CnsF90IlveeVLO9g=";
+  };
+
   flashmla = stdenv.mkDerivation {
     pname = "flashmla";
     # https://github.com/vllm-project/FlashMLA/blob/${src.rev}/setup.py
@@ -123,7 +137,7 @@ let
     # flashmla normally relies on `git submodule update` to fetch cutlass
     buildPhase = ''
       rm -rf csrc/cutlass
-      ln -sf ${cutlass} csrc/cutlass
+      ln -sf ${cutlass-flashmla} csrc/cutlass
     '';
 
     installPhase = ''
@@ -199,19 +213,16 @@ let
         "8.9"
         "9.0"
         "9.0a"
-        # Blackwell (SM100+) capabilities temporarily disabled due to CUTLASS API incompatibility
-        # FlashMLA kernels require CUTLASS v4.2.1+ APIs not available in bundled v4.0.0
-        # TODO: Re-enable when vLLM upgrades CUTLASS (see https://github.com/vllm-project/vllm/pull/24673)
-        # "10.0"
-        # "10.0a"
-        # "10.1"
-        # "10.1a"
-        # "10.3"
-        # "10.3a"
-        # "12.0"
-        # "12.0a"
-        # "12.1"
-        # "12.1a"
+        "10.0"
+        "10.0a"
+        "10.1"
+        "10.1a"
+        "10.3"
+        "10.3a"
+        "12.0"
+        "12.0a"
+        "12.1"
+        "12.1a"
       ];
       ptx = lists.map (x: "${x}+PTX") real;
     in