FKIE_CVE-2026-23231

Vulnerability from fkie_nvd - Published: 2026-03-04 13:15 - Updated: 2026-03-17 21:22
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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: 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. 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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a6586ecfa4ce1413daaafee250d2590e05f1a33Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2f9a4ffeb763aec822f8ff3d1e82202d27d46d4bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7017745068a9068904e1e7a1b170a5785647cc81Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/71e99ee20fc3f662555118cf1159443250647533Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dbd0af8083dd201f07c49110b2ee93710abdff28Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f3fe58ce37926a10115ede527d59b91bcc05400aPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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      "lang": "en",
      "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-\u003echains 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-\u003echains\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-\u003eblob_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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      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: nf_tables: corrige uso despu\u00e9s de liberaci\u00f3n en nf_tables_addchain()\n\nnf_tables_addchain() publica la cadena en table-\u0026gt;chains a trav\u00e9s 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 per\u00edodo de gracia RCU intermedio.\n\nEsto crea dos condiciones de uso despu\u00e9s de liberaci\u00f3n:\n\n1) Plano de control: nf_tables_dump_chains() recorre table-\u0026gt;chains bajo rcu_read_lock(). Un volcado concurrente a\u00fan 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 trav\u00e9s del gancho IPv4 transitorio a\u00fan pueden estar desreferenciando chain-\u0026gt;blob_gen_X cuando la ruta de error libera la cadena.\n\nA\u00f1adir synchronize_rcu() entre nft_chain_del() y la destrucci\u00f3n de la cadena para que todos los lectores RCU -- tanto los hilos de volcado como la evaluaci\u00f3n de paquetes en curso -- hayan terminado antes de que la cadena sea liberada."
    }
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  "id": "CVE-2026-23231",
  "lastModified": "2026-03-17T21:22:06.590",
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          "attackVector": "LOCAL",
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          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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