diff --git a/vllm/distributed/kv_events.py b/vllm/distributed/kv_events.py
index 46f0cd9289b2..724ce367a298 100644
--- a/vllm/distributed/kv_events.py
+++ b/vllm/distributed/kv_events.py
@@ -51,6 +51,7 @@ class BlockStored(KVCacheEvent):
     block_size: int
     lora_id: Optional[int]
     medium: Optional[str]
+    mm_hashes: list[list[str]]
 
 
 class BlockRemoved(KVCacheEvent):
diff --git a/vllm/outputs.py b/vllm/outputs.py
index 4d8206bb2d83..e37e98ecde90 100644
--- a/vllm/outputs.py
+++ b/vllm/outputs.py
@@ -116,6 +116,7 @@ def __init__(
         *,
         multi_modal_placeholders: Optional[MultiModalPlaceholderDict] = None,
         kv_transfer_params: Optional[dict[str, Any]] = None,
+        mm_hashes: Optional[list[str]] = None,
         # Forward compatibility, code that uses args added in new release can
         # still run with older versions of vLLM without breaking.
         **kwargs: Any,
@@ -136,6 +137,7 @@ def __init__(
         self.encoder_prompt_token_ids = encoder_prompt_token_ids
         self.num_cached_tokens = num_cached_tokens
         self.kv_transfer_params = kv_transfer_params
+        self.mm_hashes = mm_hashes
 
     def add(self, next_output: "RequestOutput", aggregate: bool) -> None:
         """Merge subsequent RequestOutput into this one"""
diff --git a/vllm/v1/core/block_pool.py b/vllm/v1/core/block_pool.py
index 3cc738304821..db2508a9c2cd 100644
--- a/vllm/v1/core/block_pool.py
+++ b/vllm/v1/core/block_pool.py
@@ -252,7 +252,10 @@ def cache_full_blocks(
                     lora_id=request.lora_request.id
                     if request.lora_request else None,
                     medium=MEDIUM_GPU,
-                ))
+                    mm_hashes=self._get_block_mm_hash(request,
+                                                      num_cached_blocks,
+                                                      num_full_blocks,
+                                                      block_size)))
 
     def get_new_blocks(self, num_blocks: int) -> list[KVCacheBlock]:
         """Get new blocks from the free block pool.
@@ -414,3 +417,18 @@ def take_events(self) -> list[KVCacheEvent]:
         events = self.kv_event_queue
         self.kv_event_queue = []
         return events
+
+    def _get_block_mm_hash(self, request: Request, num_cached_blocks: int,
+                           num_full_blocks: int, block_size: int):
+        block_mm_hashes: list[list[str]] = [[]
+                                            for _ in range(num_full_blocks -
+                                                           num_cached_blocks)]
+        start_token_idx = num_cached_blocks * block_size
+        end_token_idx = num_full_blocks + block_size
+        for mm_feature in request.mm_features:
+            if (mm_feature.mm_position.offset >= start_token_idx
+                    and mm_feature.mm_position.offset < end_token_idx):
+                block_mm_hashes[(mm_feature.mm_position.offset -
+                                 start_token_idx) // block_size].append(
+                                     mm_feature.identifier)
+        return block_mm_hashes
diff --git a/vllm/v1/engine/output_processor.py b/vllm/v1/engine/output_processor.py
index 38b2d6824b47..2e36ba2e2f0d 100644
--- a/vllm/v1/engine/output_processor.py
+++ b/vllm/v1/engine/output_processor.py
@@ -98,6 +98,7 @@ def __init__(
         top_p: Optional[float] = None,
         n: Optional[int] = None,
         temperature: Optional[float] = None,
+        mm_hashes=None,
     ):
         self.request_id = request_id
         self.parent_req = parent_req
@@ -118,6 +119,7 @@ def __init__(
         self.is_prefilling = True
         self.queue = queue
         self.num_cached_tokens = 0
+        self.mm_hashes = mm_hashes
 
         self.stats = RequestStateStats(
             arrival_time=arrival_time) if log_stats else None
@@ -132,6 +134,7 @@ def from_new_request(
         request_index: int,
         queue: Optional[RequestOutputCollector],
         log_stats: bool,
+        mm_hashes: list[str],
     ) -> "RequestState":
 
         if sampling_params := request.sampling_params:
@@ -179,6 +182,7 @@ def from_new_request(
             arrival_time=request.arrival_time,
             queue=queue,
             log_stats=log_stats,
+            mm_hashes=mm_hashes,
         )
 
     def make_request_output(
@@ -257,6 +261,7 @@ def _new_request_output(
             finished=finished,
             kv_transfer_params=kv_transfer_params,
             num_cached_tokens=self.num_cached_tokens,
+            mm_hashes=self.mm_hashes,
         )
 
     def _new_completion_output(
@@ -365,13 +370,15 @@ def add_request(
         if request_id in self.request_states:
             raise ValueError(f"Request id {request_id} already running.")
 
+        mm_hashes = [f.identifier for f in request.mm_features]
         req_state = RequestState.from_new_request(tokenizer=self.tokenizer,
                                                   request=request,
                                                   prompt=prompt,
                                                   parent_req=parent_req,
                                                   request_index=request_index,
                                                   queue=queue,
-                                                  log_stats=self.log_stats)
+                                                  log_stats=self.log_stats,
+                                                  mm_hashes=mm_hashes)
         self.request_states[request_id] = req_state
         self.lora_states.add_request(req_state)
         if parent_req: