CVE-2024-56655 (GCVE-0-2024-56655)
Vulnerability from cvelistv5
Published
2024-12-27 15:06
Modified
2025-06-04 12:57
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 Version: 9eee6097ffb26cdd2adb988c0d378fa0d650c737
Version: 558f503f707f481bbf40efa74a938b8021df841d
Version: a394c160d57f4b083bd904a22802f6fb7f5b3cea
Version: e6c32a64d61184c2bdf89442b3d31ef530afba34
Version: bfd05c68e4c6320304e9f371ffa356b6e4b9cc53
Version: c03d278fdf35e73dd0ec543b9b556876b9d9a8dc
Version: c03d278fdf35e73dd0ec543b9b556876b9d9a8dc
Version: cb401e5799e0acacb405f2128097e9c4ccf82f8a
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{
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          "programFiles": [
            "include/net/netfilter/nf_tables.h",
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          "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."
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        "dateUpdated": "2025-06-04T12:57:20.080Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/b04df3da1b5c6f6dc7cdccc37941740c078c4043"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56655",
    "datePublished": "2024-12-27T15:06:19.033Z",
    "dateReserved": "2024-12-27T15:00:39.841Z",
    "dateUpdated": "2025-06-04T12:57:20.080Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-56655\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-27T15:15:25.343\",\"lastModified\":\"2025-06-04T13:15:25.473\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"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\":\"6.6.61\",\"versionEndExcluding\":\"6.6.67\",\"matchCriteriaId\":\"C62FB1DE-4AB5-4D7C-98C4-53F3C7625780\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11.8\",\"versionEndExcluding\":\"6.12.6\",\"matchCriteriaId\":\"08380928-8FCA-4224-BB24-9918A2D1E85E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"62567B3C-6CEE-46D0-BC2E-B3717FBF7D13\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"5A073481-106D-4B15-B4C7-FB0213B8E1D4\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/27f0574253f6c24c8ee4e3f0a685b75ed3a256ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2991dc357a28b61c13ed1f7b59e9251e2b4562fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5146c27b2780aac59876a887a5f4e793b8949862\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7cf0bd232b565d9852cb25fd094f77254773e048\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b04df3da1b5c6f6dc7cdccc37941740c078c4043\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b0f013bebf94fe7ae75e5a53be2f2bd1cc1841e3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b8d8f53e1858178882b881b8c09f94ef0e83bf76\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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