fkie_cve-2024-56655
Vulnerability from fkie_nvd
Published
2024-12-27 15:15
Modified
2025-06-04 13:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: do not defer rule destruction via call_rcu
nf_tables_chain_destroy can sleep, it can't be used from call_rcu
callbacks.
Moreover, nf_tables_rule_release() is only safe for error unwinding,
while transaction mutex is held and the to-be-desroyed rule was not
exposed to either dataplane or dumps, as it deactives+frees without
the required synchronize_rcu() in-between.
nft_rule_expr_deactivate() callbacks will change ->use counters
of other chains/sets, see e.g. nft_lookup .deactivate callback, these
must be serialized via transaction mutex.
Also add a few lockdep asserts to make this more explicit.
Calling synchronize_rcu() isn't ideal, but fixing this without is hard
and way more intrusive. As-is, we can get:
WARNING: .. net/netfilter/nf_tables_api.c:5515 nft_set_destroy+0x..
Workqueue: events nf_tables_trans_destroy_work
RIP: 0010:nft_set_destroy+0x3fe/0x5c0
Call Trace:
<TASK>
nf_tables_trans_destroy_work+0x6b7/0xad0
process_one_work+0x64a/0xce0
worker_thread+0x613/0x10d0
In case the synchronize_rcu becomes an issue, we can explore alternatives.
One way would be to allocate nft_trans_rule objects + one nft_trans_chain
object, deactivate the rules + the chain and then defer the freeing to the
nft destroy workqueue. We'd still need to keep the synchronize_rcu path as
a fallback to handle -ENOMEM corner cases though.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 6.13 | |
| linux | linux_kernel | 6.13 |
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"descriptions": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: do not defer rule destruction via call_rcu\n\nnf_tables_chain_destroy can sleep, it can\u0027t be used from call_rcu\ncallbacks.\n\nMoreover, nf_tables_rule_release() is only safe for error unwinding,\nwhile transaction mutex is held and the to-be-desroyed rule was not\nexposed to either dataplane or dumps, as it deactives+frees without\nthe required synchronize_rcu() in-between.\n\nnft_rule_expr_deactivate() callbacks will change -\u003euse counters\nof other chains/sets, see e.g. nft_lookup .deactivate callback, these\nmust be serialized via transaction mutex.\n\nAlso add a few lockdep asserts to make this more explicit.\n\nCalling synchronize_rcu() isn\u0027t ideal, but fixing this without is hard\nand way more intrusive. As-is, we can get:\n\nWARNING: .. net/netfilter/nf_tables_api.c:5515 nft_set_destroy+0x..\nWorkqueue: events nf_tables_trans_destroy_work\nRIP: 0010:nft_set_destroy+0x3fe/0x5c0\nCall Trace:\n \u003cTASK\u003e\n nf_tables_trans_destroy_work+0x6b7/0xad0\n process_one_work+0x64a/0xce0\n worker_thread+0x613/0x10d0\n\nIn case the synchronize_rcu becomes an issue, we can explore alternatives.\n\nOne way would be to allocate nft_trans_rule objects + one nft_trans_chain\nobject, deactivate the rules + the chain and then defer the freeing to the\nnft destroy workqueue. We\u0027d still need to keep the synchronize_rcu path as\na fallback to handle -ENOMEM corner cases though."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nf_tables: no aplazar la destrucci\u00f3n de la regla mediante call_rcu nf_tables_chain_destroy puede dormir, no se puede utilizar desde las devoluciones de llamadas call_rcu. Adem\u00e1s, nf_tables_rule_release() solo es seguro para desenrollar errores, mientras se mantiene el mutex de transacci\u00f3n y la regla a destruir no se expuso ni al plano de datos ni a los volcados, ya que desactiva + libera sin elsynchronous_rcu() requerido en el medio. Las devoluciones de llamadas nft_rule_expr_deactivate() cambiar\u00e1n -\u0026gt;use contadores de otras cadenas/conjuntos, consulte, por ejemplo, la devoluci\u00f3n de llamada nft_lookup .deactivate, que se deben serializar mediante el mutex de transacci\u00f3n. Agregue tambi\u00e9n algunas afirmaciones lockdep para que esto sea m\u00e1s expl\u00edcito. Llamar asynchronous_rcu() no es ideal, pero solucionar esto sin \u00e9l es dif\u00edcil y mucho m\u00e1s intrusivo. Tal como est\u00e1, podemos obtener: ADVERTENCIA: .. net/netfilter/nf_tables_api.c:5515 nft_set_destroy+0x.. Cola de trabajo: eventos nf_tables_trans_destroy_work RIP: 0010:nft_set_destroy+0x3fe/0x5c0 Rastreo de llamadas: nf_tables_trans_destroy_work+0x6b7/0xad0 process_one_work+0x64a/0xce0 worker_thread+0x613/0x10d0 En caso de que elsynchronous_rcu se convierta en un problema, podemos explorar alternativas. Una forma ser\u00eda asignar objetos nft_trans_rule + un objeto nft_trans_chain, desactivar las reglas + la cadena y luego diferir la liberaci\u00f3n a la cola de trabajo de destrucci\u00f3n de nft. A\u00fan as\u00ed, necesitar\u00edamos mantener la ruta synchronization_rcu como respaldo para gestionar casos especiales de -ENOMEM."
}
],
"id": "CVE-2024-56655",
"lastModified": "2025-06-04T13:15:25.473",
"metrics": {
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"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
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"published": "2024-12-27T15:15:25.343",
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"type": "Primary"
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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