diff --git a/cmd/zfs/zfs_main.c b/cmd/zfs/zfs_main.c
index 836979bdf741..d7c1a2a4774b 100644
--- a/cmd/zfs/zfs_main.c
+++ b/cmd/zfs/zfs_main.c
@@ -5862,7 +5862,11 @@ share_mount(int op, int argc, char **argv)
 		 * display any active ZFS mounts.  We hide any snapshots, since
 		 * they are controlled automatically.
 		 */
-		rewind(mnttab_file);
+
+		/* Reopen MNTTAB to prevent reading stale data from open file */
+		if (freopen(MNTTAB, "r", mnttab_file) == NULL)
+			return (ENOENT);
+
 		while (getmntent(mnttab_file, &entry) == 0) {
 			if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0 ||
 			    strchr(entry.mnt_special, '@') != NULL)
@@ -5965,7 +5969,11 @@ unshare_unmount_path(int op, char *path, int flags, boolean_t is_manual)
 	/*
 	 * Search for the given (major,minor) pair in the mount table.
 	 */
-	rewind(mnttab_file);
+
+	/* Reopen MNTTAB to prevent reading stale data from open file */
+	if (freopen(MNTTAB, "r", mnttab_file) == NULL)
+		return (ENOENT);
+
 	while ((ret = getextmntent(mnttab_file, &entry, 0)) == 0) {
 		if (entry.mnt_major == major(statbuf.st_dev) &&
 		    entry.mnt_minor == minor(statbuf.st_dev))
@@ -6119,7 +6127,10 @@ unshare_unmount(int op, int argc, char **argv)
 		    ((tree = uu_avl_create(pool, NULL, UU_DEFAULT)) == NULL))
 			nomem();
 
-		rewind(mnttab_file);
+		/* Reopen MNTTAB to prevent reading stale data from open file */
+		if (freopen(MNTTAB, "r", mnttab_file) == NULL)
+			return (ENOENT);
+
 		while (getmntent(mnttab_file, &entry) == 0) {
 
 			/* ignore non-ZFS entries */
diff --git a/lib/libzfs/libzfs_mount.c b/lib/libzfs/libzfs_mount.c
index 3cd6406b26c0..b85c5d04ffea 100644
--- a/lib/libzfs/libzfs_mount.c
+++ b/lib/libzfs/libzfs_mount.c
@@ -1165,7 +1165,10 @@ zpool_disable_datasets(zpool_handle_t *zhp, boolean_t force)
 
 	namelen = strlen(zhp->zpool_name);
 
-	rewind(hdl->libzfs_mnttab);
+	/* Reopen MNTTAB to prevent reading stale data from open file */
+	if (freopen(MNTTAB, "r", hdl->libzfs_mnttab) == NULL)
+		return (ENOENT);
+
 	used = alloc = 0;
 	while (getmntent(hdl->libzfs_mnttab, &entry) == 0) {
 		/*
diff --git a/lib/libzfs/libzfs_util.c b/lib/libzfs/libzfs_util.c
index 706ae1769f69..e99603b49ed9 100644
--- a/lib/libzfs/libzfs_util.c
+++ b/lib/libzfs/libzfs_util.c
@@ -793,7 +793,10 @@ zfs_path_to_zhandle(libzfs_handle_t *hdl, char *path, zfs_type_t argtype)
 		return (NULL);
 	}
 
-	rewind(hdl->libzfs_mnttab);
+	/* Reopen MNTTAB to prevent reading stale data from open file */
+	if (freopen(MNTTAB, "r", hdl->libzfs_mnttab) == NULL)
+		return (NULL);
+
 	while ((ret = getextmntent(hdl->libzfs_mnttab, &entry, 0)) == 0) {
 		if (makedevice(entry.mnt_major, entry.mnt_minor) ==
 		    statbuf.st_dev) {