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…

PriorityP338high7.8CVSS 3.1

AVLACLPRLUINSUCHIHAH

EPSS

0.14%

3.9th percentile

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]/

Affected

9 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.16.3-1 (forky)	linux 6.16.3-1 (forky)
linux	linux	—	—
linux	linux	>= 4c975fd700022c90e61a46326e3444e08317876e < 57a7ef338a2cd62a22a15a199ab9afd3d953df55	57a7ef338a2cd62a22a15a199ab9afd3d953df55
linux	linux	>= 4c975fd700022c90e61a46326e3444e08317876e < 628e233c1fefcc227fae9bdcff6be8ac92e1b4d2	628e233c1fefcc227fae9bdcff6be8ac92e1b4d2
linux	linux	>= 4c975fd700022c90e61a46326e3444e08317876e < 53898ebabe843bfa7baea9dae152797d5d0563c9	53898ebabe843bfa7baea9dae152797d5d0563c9
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 6.16.3-1	6.16.3-1
linux	linux_kernel	>= 6.15 < 6.15.11	6.15.11
linux	linux_kernel	>= 6.16 < 6.16.2	6.16.2

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

osv7.8HIGH

vendor_debian7.8LOW

vendor_redhat7.8HIGH

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