1 files changed, 4 insertions, 0 deletions

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 22571488730a..f1c0c2e9cad5 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2987,6 +2987,10 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
                 t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].extra1 = dev;
         }
 
+        /* Don't export sysctls to unprivileged users */
+        if (neigh_parms_net(p)->user_ns != &init_user_ns)
+                t->neigh_vars[0].procname = NULL;
+
         snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s",
                 p_name, dev_name_source);
         t->sysctl_header =