CVE-2025-39796
Full vulnerability record from the local CVENow database.
Description
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]/
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-12 16:15:33.987000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
{
"id": "CVE-2025-39796",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-09-12T16:15:33.987",
"lastModified": "2026-10-19T21:10:00.160",
"vulnStatus": "Analyzed",
"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/[email protected]/"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: lapbether: ignorar dispositivos de red bloqueados por operaciones\n\nSyzkaller logró desencadenar una dependencia de bloqueo en xsk_notify a través de register_netdevice. Como se discutió en [0], usar register_netdevice en los notificadores es problemático, por lo que se omite añadir lapbeth para dispositivos bloqueados por operaciones.\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/[email protected]/"
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/net/wan/lapbether.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "4c975fd700022c90e61a46326e3444e08317876e",
"lessThan": "57a7ef338a2cd62a22a15a199ab9afd3d953df55",
"versionType": "git",
"status": "affected"
},
{
"version": "4c975fd700022c90e61a46326e3444e08317876e",
"lessThan": "628e233c1fefcc227fae9bdcff6be8ac92e1b4d2",
"versionType": "git",
"status": "affected"
},
{
"version": "4c975fd700022c90e61a46326e3444e08317876e",
"lessThan": "53898ebabe843bfa7baea9dae152797d5d0563c9",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/net/wan/lapbether.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.15",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.15",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.15.11",
"lessThanOrEqual": "6.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.16.2",
"lessThanOrEqual": "6.16.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.17",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.15",
"versionEndExcluding": "6.15.11",
"matchCriteriaId": "665E04B3-3C2F-4D7D-83BD-8A89096B94F5"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.16",
"versionEndExcluding": "6.16.2",
"matchCriteriaId": "BD7C087D-2415-4521-B624-30003352F899"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*",
"matchCriteriaId": "327D22EF-390B-454C-BD31-2ED23C998A1C"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/53898ebabe843bfa7baea9dae152797d5d0563c9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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},
{
"url": "https://git.kernel.org/stable/c/57a7ef338a2cd62a22a15a199ab9afd3d953df55",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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},
{
"url": "https://git.kernel.org/stable/c/628e233c1fefcc227fae9bdcff6be8ac92e1b4d2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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}
]
}