{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43167",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-43167"
  ],
  "published": "2026-05-06T11:29:17Z",
  "summary": "xfrm: always flush state and policy upon NETDEV_UNREGISTER event",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: always flush state and policy upon NETDEV_UNREGISTER event\n\nsyzbot is reporting that \"struct xfrm_state\" refcount is leaking.\n\n  unregister_netdevice: waiting for netdevsim0 to become free. Usage count = 2\n  ref_tracker: netdev@ffff888052f24618 has 1/1 users at\n       __netdev_tracker_alloc include/linux/netdevice.h:4400 [inline]\n       netdev_tracker_alloc include/linux/netdevice.h:4412 [inline]\n       xfrm_dev_state_add+0x3a5/0x1080 net/xfrm/xfrm_device.c:316\n       xfrm_state_construct net/xfrm/xfrm_user.c:986 [inline]\n       xfrm_add_sa+0x34ff/0x5fa0 net/xfrm/xfrm_user.c:1022\n       xfrm_user_rcv_msg+0x58e/0xc00 net/xfrm/xfrm_user.c:3507\n       netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2550\n       xfrm_netlink_rcv+0x71/0x90 net/xfrm/xfrm_user.c:3529\n       netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]\n       netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1344\n       netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1894\n       sock_sendmsg_nosec net/socket.c:727 [inline]\n       __sock_sendmsg net/socket.c:742 [inline]\n       ____sys_sendmsg+0xa5d/0xc30 net/socket.c:2592\n       ___sys_sendmsg+0x134/0x1d0 net/socket.c:2646\n       __sys_sendmsg+0x16d/0x220 net/socket.c:2678\n       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n       do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94\n       entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThis is because commit d77e38e612a0 (\"xfrm: Add an IPsec hardware\noffloading API\") implemented xfrm_dev_unregister() as no-op despite\nxfrm_dev_state_add() from xfrm_state_construct() acquires a reference\nto \"struct net_device\".\nI guess that that commit expected that NETDEV_DOWN event is fired before\nNETDEV_UNREGISTER event fires, and also assumed that xfrm_dev_state_add()\nis called only if (dev->features & NETIF_F_HW_ESP) != 0.\n\nSabrina Dubroca identified steps to reproduce the same symptoms as below.\n\n  echo 0 > /sys/bus/netdevsim/new_device\n  dev=$(ls -1 /sys/bus/netdevsim/devices/netdevsim0/net/)\n  ip xfrm state add src 192.168.13.1 dst 192.168.13.2 proto esp \\\n     spi 0x1000 mode tunnel aead 'rfc4106(gcm(aes))' $key 128   \\\n     offload crypto dev $dev dir out\n  ethtool -K $dev esp-hw-offload off\n  echo 0 > /sys/bus/netdevsim/del_device\n\nLike these steps indicate, the NETIF_F_HW_ESP bit can be cleared after\nxfrm_dev_state_add() acquired a reference to \"struct net_device\".\nAlso, xfrm_dev_state_add() does not check for the NETIF_F_HW_ESP bit\nwhen acquiring a reference to \"struct net_device\".\n\nCommit 03891f820c21 (\"xfrm: handle NETDEV_UNREGISTER for xfrm device\")\nre-introduced the NETDEV_UNREGISTER event to xfrm_dev_event(), but that\ncommit for unknown reason chose to share xfrm_dev_down() between the\nNETDEV_DOWN event and the NETDEV_UNREGISTER event.\nI guess that that commit missed the behavior in the previous paragraph.\n\nTherefore, we need to re-introduce xfrm_dev_unregister() in order to\nrelease the reference to \"struct net_device\" by unconditionally flushing\nstate and policy.",
  "affected": [
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