CVE-2023-54200
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: always release netdev hooks from notifier This reverts "netfilter: nf_tables: skip netdev events generated on netns removal". The problem is that when a veth device is released, the veth release callback will also queue the peer netns device for removal. Its possible that the peer netns is also slated for removal. In this case, the device memory is already released before the pre_exit hook of the peer netns runs: BUG: KASAN: slab-use-after-free in nf_hook_entry_head+0x1b8/0x1d0 Read of size 8 at addr ffff88812c0124f0 by task kworker/u8:1/45 Workqueue: netns cleanup_net Call Trace: nf_hook_entry_head+0x1b8/0x1d0 __nf_unregister_net_hook+0x76/0x510 nft_netdev_unregister_hooks+0xa0/0x220 __nft_release_hook+0x184/0x490 nf_tables_pre_exit_net+0x12f/0x1b0 .. Order is: 1. First netns is released, veth_dellink() queues peer netns device for removal 2. peer netns is queued for removal 3. peer netns device is released, unreg event is triggered 4. unreg event is ignored because netns is going down 5. pre_exit hook calls nft_netdev_unregister_hooks but device memory might be free'd already.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Deferred
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-12-30 13:16:08.100000
Last modified
2026-10-28 19:10:00.193000
View original CVE JSON
{
"id": "CVE-2023-54200",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-12-30T13:16:08.100",
"lastModified": "2026-10-28T19:10:00.193",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: always release netdev hooks from notifier\n\nThis reverts \"netfilter: nf_tables: skip netdev events generated on netns removal\".\n\nThe problem is that when a veth device is released, the veth release\ncallback will also queue the peer netns device for removal.\n\nIts possible that the peer netns is also slated for removal. In this\ncase, the device memory is already released before the pre_exit hook of\nthe peer netns runs:\n\nBUG: KASAN: slab-use-after-free in nf_hook_entry_head+0x1b8/0x1d0\nRead of size 8 at addr ffff88812c0124f0 by task kworker/u8:1/45\nWorkqueue: netns cleanup_net\nCall Trace:\n nf_hook_entry_head+0x1b8/0x1d0\n __nf_unregister_net_hook+0x76/0x510\n nft_netdev_unregister_hooks+0xa0/0x220\n __nft_release_hook+0x184/0x490\n nf_tables_pre_exit_net+0x12f/0x1b0\n ..\n\nOrder is:\n1. First netns is released, veth_dellink() queues peer netns device\n for removal\n2. peer netns is queued for removal\n3. peer netns device is released, unreg event is triggered\n4. unreg event is ignored because netns is going down\n5. pre_exit hook calls nft_netdev_unregister_hooks but device memory\n might be free'd already."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: nf_tables: siempre liberar hooks de netdev desde el notificador\n\nEsto revierte ’netfilter: nf_tables: omitir eventos de netdev generados en la eliminación de netns’.\n\nEl problema es que cuando un dispositivo veth es liberado, la callback de liberación de veth también pondrá en cola el dispositivo netns par para su eliminación.\n\nEs posible que el netns par también esté programado para su eliminación. En este caso, la memoria del dispositivo ya está liberada antes de que el hook pre_exit del netns par se ejecute:\n\nBUG: KASAN: uso después de liberación de slab en nf_hook_entry_head+0x1b8/0x1d0\nLectura de tamaño 8 en la dirección ffff88812c0124f0 por la tarea kworker/u8:1/45\nCola de trabajo: netns cleanup_net\nRastro de llamada:\n nf_hook_entry_head+0x1b8/0x1d0\n __nf_unregister_net_hook+0x76/0x510\n nft_netdev_unregister_hooks+0xa0/0x220\n __nft_release_hook+0x184/0x490\n nf_tables_pre_exit_net+0x12f/0x1b0\n ..\n\nEl orden es:\n1. El primer netns es liberado, veth_dellink() pone en cola el dispositivo netns par para su eliminación\n2. El netns par es puesto en cola para su eliminación\n3. El dispositivo netns par es liberado, se dispara el evento de desregistro\n4. El evento de desregistro es ignorado porque el netns se está cerrando\n5. El hook pre_exit llama a nft_netdev_unregister_hooks pero la memoria del dispositivo podría haber sido liberada ya."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"net/netfilter/nft_chain_filter.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "68a3765c659f809dcaac20030853a054646eb739",
"lessThan": "8d56f00c61f67b450fbbdcb874855e60ad92c560",
"versionType": "git",
"status": "affected"
},
{
"version": "68a3765c659f809dcaac20030853a054646eb739",
"lessThan": "30e4b13b1bfbdf3bf3b27036d8209ea1b9f0d880",
"versionType": "git",
"status": "affected"
},
{
"version": "68a3765c659f809dcaac20030853a054646eb739",
"lessThan": "94032527efbac13be702c76afb9d872c0cca7a43",
"versionType": "git",
"status": "affected"
},
{
"version": "68a3765c659f809dcaac20030853a054646eb739",
"lessThan": "dc1c9fd4a8bbe1e06add9053010b652449bfe411",
"versionType": "git",
"status": "affected"
},
{
"version": "90c7c58aa2bd02c65a4c63b7dfe0b16eab12cf9f",
"versionType": "git",
"status": "affected"
},
{
"version": "5.14.15",
"lessThan": "5.15",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"net/netfilter/nft_chain_filter.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "5.15",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.15",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.113",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.30",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.3.4",
"lessThanOrEqual": "6.3.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.4",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"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
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-10-15T21:39:16.069317Z",
"id": "CVE-2023-54200",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/30e4b13b1bfbdf3bf3b27036d8209ea1b9f0d880",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8d56f00c61f67b450fbbdcb874855e60ad92c560",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/94032527efbac13be702c76afb9d872c0cca7a43",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/dc1c9fd4a8bbe1e06add9053010b652449bfe411",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}