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CVE-2026-23231

Estado: ModificadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_tables: fix use-after-free in nf_tables_addchain()

nf_tables_addchain() publishes the chain to table->chains via list_add_tail_rcu() (in nft_chain_add()) before registering hooks. If nf_tables_register_hook() then fails, the error path calls nft_chain_del() (list_del_rcu()) followed by nf_tables_chain_destroy() with no RCU grace period in between.

This creates two use-after-free conditions:

Add synchronize_rcu() between nft_chain_del() and the chain destroy so that all RCU readers -- both dump threads and in-flight packet evaluation -- have finished before the chain is freed.

Detalles técnicos trazas, registros y código del informe original
 1) Control-plane: nf_tables_dump_chains() traverses table->chains
    under rcu_read_lock(). A concurrent dump can still be walking
    the chain when the error path frees it.

 2) Packet path: for NFPROTO_INET, nf_register_net_hook() briefly
    installs the IPv4 hook before IPv6 registration fails.  Packets
    entering nft_do_chain() via the transient IPv4 hook can still be
    dereferencing chain->blob_gen_X when the error path frees the
    chain.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Use-after-free (CWE-416) en kernel Linux con acceso local (AV:L/PR:L) permite ejecución de código en el contexto del kernel. La vulnerabilidad se activa tras fallo en registro de hooks en netfilter, sin interacción del usuario.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: fix use-after-free in nf_tables_addchain()\n\nnf_tables_addchain() publishes the chain to table->chains via\nlist_add_tail_rcu() (in nft_chain_add()) before registering hooks.\nIf nf_tables_register_hook() then fails, the error path calls\nnft_chain_del() (list_del_rcu()) followed by nf_tables_chain_destroy()\nwith no RCU grace period in between.\n\nThis creates two use-after-free conditions:\n\n 1) Control-plane: nf_tables_dump_chains() traverses table->chains\n    under rcu_read_lock(). A concurrent dump can still be walking\n    the chain when the error path frees it.\n\n 2) Packet path: for NFPROTO_INET, nf_register_net_hook() briefly\n    installs the IPv4 hook before IPv6 registration fails.  Packets\n    entering nft_do_chain() via the transient IPv4 hook can still be\n    dereferencing chain->blob_gen_X when the error path frees the\n    chain.\n\nAdd synchronize_rcu() between nft_chain_del() and the chain destroy\nso that all RCU readers -- both dump threads and in-flight packet\nevaluation -- have finished before the chain is freed."
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      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: nf_tables: corrige uso después de liberación en nf_tables_addchain()\n\nnf_tables_addchain() publica la cadena en table->chains a través de list_add_tail_rcu() (en nft_chain_add()) antes de registrar los ganchos. Si nf_tables_register_hook() falla entonces, la ruta de error llama a nft_chain_del() (list_del_rcu()) seguido de nf_tables_chain_destroy() sin un período de gracia RCU intermedio.\n\nEsto crea dos condiciones de uso después de liberación:\n\n1) Plano de control: nf_tables_dump_chains() recorre table->chains bajo rcu_read_lock(). Un volcado concurrente aún puede estar recorriendo la cadena cuando la ruta de error la libera.\n\n2) Ruta de paquetes: para NFPROTO_INET, nf_register_net_hook() instala brevemente el gancho IPv4 antes de que falle el registro de IPv6. Los paquetes que entran en nft_do_chain() a través del gancho IPv4 transitorio aún pueden estar desreferenciando chain->blob_gen_X cuando la ruta de error libera la cadena.\n\nAñadir synchronize_rcu() entre nft_chain_del() y la destrucción de la cadena para que todos los lectores RCU -- tanto los hilos de volcado como la evaluación de paquetes en curso -- hayan terminado antes de que la cadena sea liberada."
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