diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index 308d8a94865f..42e9689d7f35 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -2001,7 +2001,7 @@ mlxsw_core_health_fw_fatal_test(struct devlink_health_reporter *reporter,
 				struct netlink_ext_ack *extack)
 {
 	struct mlxsw_core *mlxsw_core = devlink_health_reporter_priv(reporter);
-	char mfgd_pl[MLXSW_REG_MFGD_LEN];
+	char mfgd_pl[MLXSW_REG_MFGD_LEN] = {0};
 	int err;
 
 	/* Read the register first to make sure no other bits are changed. */
@@ -2022,7 +2022,7 @@ mlxsw_core_health_fw_fatal_ops = {
 static int mlxsw_core_health_fw_fatal_config(struct mlxsw_core *mlxsw_core,
 					     bool enable)
 {
-	char mfgd_pl[MLXSW_REG_MFGD_LEN];
+	char mfgd_pl[MLXSW_REG_MFGD_LEN] = {0};
 	int err;
 
 	/* Read the register first to make sure no other bits are changed. */
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c b/drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c
index 30f172ce822c..a5e7aee730d6 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c
@@ -120,7 +120,7 @@ static ssize_t mlxsw_hwmon_temp_rst_store(struct device *dev,
 			container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
 	struct mlxsw_hwmon_dev *mlxsw_hwmon_dev = mlxsw_hwmon_attr->mlxsw_hwmon_dev;
 	struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
-	char mtmp_pl[MLXSW_REG_MTMP_LEN];
+	char mtmp_pl[MLXSW_REG_MTMP_LEN] = {0};
 	unsigned long val;
 	int index;
 	int err;
@@ -177,7 +177,7 @@ static ssize_t mlxsw_hwmon_fan_fault_show(struct device *dev,
 			container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
 	struct mlxsw_hwmon_dev *mlxsw_hwmon_dev = mlxsw_hwmon_attr->mlxsw_hwmon_dev;
 	struct mlxsw_hwmon *mlxsw_hwmon = mlxsw_hwmon_dev->hwmon;
-	char fore_pl[MLXSW_REG_FORE_LEN];
+	char fore_pl[MLXSW_REG_FORE_LEN] = {0};
 	bool fault;
 	int err;
 
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
index ae63d549b542..d54fe5e61296 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
@@ -1720,7 +1720,7 @@ static int mlxsw_sp2_span_init(struct mlxsw_sp *mlxsw_sp)
 static int mlxsw_sp2_span_policer_id_base_set(struct mlxsw_sp *mlxsw_sp,
 					      u16 policer_id_base)
 {
-	char mogcr_pl[MLXSW_REG_MOGCR_LEN];
+	char mogcr_pl[MLXSW_REG_MOGCR_LEN] = {0};
 	int err;
 
 	err = mlxsw_reg_query(mlxsw_sp->core, MLXSW_REG(mogcr), mogcr_pl);