fkie_cve-2025-39796
Vulnerability from fkie_nvd
Published
2025-09-12 16:15
Modified
2025-09-15 15:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: lapbether: ignore ops-locked netdevs Syzkaller managed to trigger lock dependency in xsk_notify via register_netdevice. As discussed in [0], using register_netdevice in the notifiers is problematic so skip adding lapbeth for ops-locked devices. xsk_notifier+0xa4/0x280 net/xdp/xsk.c:1645 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] unregister_netdevice_many_notify+0xf9d/0x2700 net/core/dev.c:12077 unregister_netdevice_many net/core/dev.c:12140 [inline] unregister_netdevice_queue+0x305/0x3f0 net/core/dev.c:11984 register_netdevice+0x18f1/0x2270 net/core/dev.c:11149 lapbeth_new_device drivers/net/wan/lapbether.c:420 [inline] lapbeth_device_event+0x5b1/0xbe0 drivers/net/wan/lapbether.c:462 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] __dev_notify_flags+0x12c/0x2e0 net/core/dev.c:9497 netif_change_flags+0x108/0x160 net/core/dev.c:9526 dev_change_flags+0xba/0x250 net/core/dev_api.c:68 devinet_ioctl+0x11d5/0x1f50 net/ipv4/devinet.c:1200 inet_ioctl+0x3a7/0x3f0 net/ipv4/af_inet.c:1001 0: https://lore.kernel.org/netdev/20250625140357.6203d0af@kernel.org/
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53898ebabe843bfa7baea9dae152797d5d0563c9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/57a7ef338a2cd62a22a15a199ab9afd3d953df55
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/628e233c1fefcc227fae9bdcff6be8ac92e1b4d2
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: lapbether: ignore ops-locked netdevs\n\nSyzkaller managed to trigger lock dependency in xsk_notify via\nregister_netdevice. As discussed in [0], using register_netdevice\nin the notifiers is problematic so skip adding lapbeth for ops-locked\ndevices.\n\n       xsk_notifier+0xa4/0x280 net/xdp/xsk.c:1645\n       notifier_call_chain+0xbc/0x410 kernel/notifier.c:85\n       call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230\n       call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]\n       call_netdevice_notifiers net/core/dev.c:2282 [inline]\n       unregister_netdevice_many_notify+0xf9d/0x2700 net/core/dev.c:12077\n       unregister_netdevice_many net/core/dev.c:12140 [inline]\n       unregister_netdevice_queue+0x305/0x3f0 net/core/dev.c:11984\n       register_netdevice+0x18f1/0x2270 net/core/dev.c:11149\n       lapbeth_new_device drivers/net/wan/lapbether.c:420 [inline]\n       lapbeth_device_event+0x5b1/0xbe0 drivers/net/wan/lapbether.c:462\n       notifier_call_chain+0xbc/0x410 kernel/notifier.c:85\n       call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230\n       call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]\n       call_netdevice_notifiers net/core/dev.c:2282 [inline]\n       __dev_notify_flags+0x12c/0x2e0 net/core/dev.c:9497\n       netif_change_flags+0x108/0x160 net/core/dev.c:9526\n       dev_change_flags+0xba/0x250 net/core/dev_api.c:68\n       devinet_ioctl+0x11d5/0x1f50 net/ipv4/devinet.c:1200\n       inet_ioctl+0x3a7/0x3f0 net/ipv4/af_inet.c:1001\n\n0: https://lore.kernel.org/netdev/20250625140357.6203d0af@kernel.org/"
    }
  ],
  "id": "CVE-2025-39796",
  "lastModified": "2025-09-15T15:21:42.937",
  "metrics": {},
  "published": "2025-09-12T16:15:33.987",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/53898ebabe843bfa7baea9dae152797d5d0563c9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/57a7ef338a2cd62a22a15a199ab9afd3d953df55"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/628e233c1fefcc227fae9bdcff6be8ac92e1b4d2"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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