CVE-2024-56655

{"id": "CVE-2024-56655", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-12-27T15:15:25.343", "references": [{"url": "https://git.kernel.org/stable/c/27f0574253f6c24c8ee4e3f0a685b75ed3a256ed", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/7cf0bd232b565d9852cb25fd094f77254773e048", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b04df3da1b5c6f6dc7cdccc37941740c078c4043", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"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"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "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't 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 ->use 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't 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 <TASK>\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'd 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 -&gt;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."}], "lastModified": "2025-05-22T13:15:54.930", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C62FB1DE-4AB5-4D7C-98C4-53F3C7625780", "versionEndExcluding": "6.6.67", "versionStartIncluding": "6.6.61"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "08380928-8FCA-4224-BB24-9918A2D1E85E", "versionEndExcluding": "6.12.6", "versionStartIncluding": "6.11.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5A073481-106D-4B15-B4C7-FB0213B8E1D4"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}