diff --git a/bes2600/bes2600_sdio.c b/bes2600/bes2600_sdio.c
index b943882..e306748 100644
--- a/bes2600/bes2600_sdio.c
+++ b/bes2600/bes2600_sdio.c
@@ -99,6 +99,7 @@ struct sbus_priv {
 	struct work_struct tx_work;
 	struct scatterlist tx_sg[BES_SDIO_TX_MULTIPLE_NUM + 1];
 	struct scatterlist tx_sg_nosignal[BES_SDIO_TX_MULTIPLE_NUM_NOSIGNAL + 1];
+	u8 *tx_bounce;
 	u32 tx_data_cnt;
 	u32 tx_xfer_cnt;
 	u32 tx_proc_cnt;
@@ -1151,7 +1152,26 @@ static void sdio_tx_work(struct work_struct *work)
 				}
 			}
 
-			sg_set_buf(&sg[scatters], tx_buffer->buf, align);
+			/*
+			 * The transfer length is rounded up to the SDIO block
+			 * size, but tx_buffer->buf is only tx_buffer->len bytes
+			 * long (it usually aliases into an skb linear head).
+			 * Copy into a driver-owned bounce buffer and zero-pad
+			 * to the aligned size; otherwise DMA reads past the
+			 * skb and leaks adjacent kernel memory on the wire --
+			 * observed as KFENCE OOB reads from
+			 * bes_sdio_memcpy_to_io_helper via dma_map_sg.
+			 */
+			if (WARN_ON_ONCE(total_len + align > MAX_SDIO_TRANSFER_LEN))
+				goto flush_previous;
+			memcpy(self->tx_bounce + total_len,
+			       tx_buffer->buf, tx_buffer->len);
+			if (align > tx_buffer->len)
+				memset(self->tx_bounce + total_len +
+				       tx_buffer->len, 0,
+				       align - tx_buffer->len);
+			sg_set_buf(&sg[scatters],
+				   self->tx_bounce + total_len, align);
 			total_len += align;
 			++scatters;
 /*del_node:*/
@@ -1936,6 +1956,17 @@ static int bes2600_sdio_probe(struct sdio_func *func,
 	if (!self->single_gathered_buffer)
 		return -ENOMEM;
 #endif
+#ifdef BES_SDIO_TX_MULTIPLE_ENABLE
+	self->tx_bounce = (u8 *)__get_dma_pages(GFP_KERNEL,
+					get_order(MAX_SDIO_TRANSFER_LEN));
+	if (!self->tx_bounce) {
+#ifndef SDIO_HOST_ADMA_SUPPORT
+		free_pages((unsigned long)self->single_gathered_buffer,
+			   get_order(MAX_SDIO_TRANSFER_LEN));
+#endif
+		return -ENOMEM;
+	}
+#endif
 #ifdef BES_SDIO_RXTX_TOGGLE
 	self->fw_started = false;
 #endif
@@ -2063,6 +2094,12 @@ static void bes2600_sdio_remove(struct sdio_func *func)
 		if (self->single_gathered_buffer) {
 			free_pages((unsigned long)self->single_gathered_buffer, get_order(MAX_SDIO_TRANSFER_LEN));
 		}
+#endif
+#ifdef BES_SDIO_TX_MULTIPLE_ENABLE
+		if (self->tx_bounce) {
+			free_pages((unsigned long)self->tx_bounce,
+				   get_order(MAX_SDIO_TRANSFER_LEN));
+		}
 #endif
 		kfree(self);
 	}