{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31579",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-31579"
  ],
  "published": "2026-04-24T14:43:40Z",
  "summary": "wireguard: device: use exit_rtnl callback instead of manual rtnl_lock in pre_exit",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwireguard: device: use exit_rtnl callback instead of manual rtnl_lock in pre_exit\n\nwg_netns_pre_exit() manually acquires rtnl_lock() inside the\npernet .pre_exit callback.  This causes a hung task when another\nthread holds rtnl_mutex - the cleanup_net workqueue (or the\nsetup_net failure rollback path) blocks indefinitely in\nwg_netns_pre_exit() waiting to acquire the lock.\n\nConvert to .exit_rtnl, introduced in commit 7a60d91c690b (\"net:\nAdd ->exit_rtnl() hook to struct pernet_operations.\"), where the\nframework already holds RTNL and batches all callbacks under a\nsingle rtnl_lock()/rtnl_unlock() pair, eliminating the contention\nwindow.\n\nThe rcu_assign_pointer(wg->creating_net, NULL) is safe to move\nfrom .pre_exit to .exit_rtnl (which runs after synchronize_rcu())\nbecause all RCU readers of creating_net either use maybe_get_net()\n- which returns NULL for a dying namespace with zero refcount - or\naccess net->user_ns which remains valid throughout the entire\nops_undo_list sequence.\n\n[ Jason: added __net_exit and __read_mostly annotations that were missing. ]",
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