CVE-2025-39796

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/[email protected]/