CVE-2026-23231
Full vulnerability record from the local CVENow database.
Description
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.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-03-04 13:15:58.137000
Last modified
2026-10-19 19:17:42.763000
View original CVE JSON
{
"id": "CVE-2026-23231",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-03-04T13:15:58.137",
"lastModified": "2026-10-19T19:17:42.763",
"vulnStatus": "Modified",
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{
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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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{
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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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