diff --git a/drivers/gpu/nova-core/falcon/fsp.rs b/drivers/gpu/nova-core/falcon/fsp.rs
index 53b1079843ae..9d7322de1ce4 100644
--- a/drivers/gpu/nova-core/falcon/fsp.rs
+++ b/drivers/gpu/nova-core/falcon/fsp.rs
@@ -17,6 +17,7 @@
         Io, //
     },
     prelude::*,
+    sizes::SZ_1K,
     time::Delta,
 };
 
@@ -34,6 +35,9 @@
 /// FSP message timeout in milliseconds.
 const FSP_MSG_TIMEOUT_MS: i64 = 2000;
 
+/// Size of the FSP EMEM channel 0 that we can use.
+const FSP_EMEM_CHANNEL_0_SIZE: usize = SZ_1K;
+
 /// Type specifying the `Fsp` falcon engine. Cannot be instantiated.
 pub(crate) struct Fsp(());
 
@@ -159,6 +163,11 @@ pub(crate) fn recv_msg(&mut self) -> Result<KVec<u8>> {
         )
         .map(num::u32_as_usize)?;
 
+        // Don't blindly allocate more than the maximum we expect from FSP.
+        if msg_size > FSP_EMEM_CHANNEL_0_SIZE {
+            return Err(EMSGSIZE);
+        }
+
         let mut buffer = KVec::<u8>::new();
         buffer.resize(msg_size, 0, GFP_KERNEL)?;