CVE-2026-23392
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: release flowtable after rcu grace period on error Call synchronize_rcu() after unregistering the hooks from error path, since a hook that already refers to this flowtable can be already registered, exposing this flowtable to packet path and nfnetlink_hook control plane. This error path is rare, it should only happen by reaching the maximum number hooks or by failing to set up to hardware offload, just call synchronize_rcu(). There is a check for already used device hooks by different flowtable that could result in EEXIST at this late stage. The hook parser can be updated to perform this check earlier to this error path really becomes rarely exercised. Uncovered by KASAN reported as use-after-free from nfnetlink_hook path when dumping hooks.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-03-25 11:16:39.873000
Last modified
2026-10-30 13:18:38.153000
View original CVE JSON
{
"id": "CVE-2026-23392",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-03-25T11:16:39.873",
"lastModified": "2026-10-30T13:18:38.153",
"vulnStatus": "Modified",
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: release flowtable after rcu grace period on error\n\nCall synchronize_rcu() after unregistering the hooks from error path,\nsince a hook that already refers to this flowtable can be already\nregistered, exposing this flowtable to packet path and nfnetlink_hook\ncontrol plane.\n\nThis error path is rare, it should only happen by reaching the maximum\nnumber hooks or by failing to set up to hardware offload, just call\nsynchronize_rcu().\n\nThere is a check for already used device hooks by different flowtable\nthat could result in EEXIST at this late stage. The hook parser can be\nupdated to perform this check earlier to this error path really becomes\nrarely exercised.\n\nUncovered by KASAN reported as use-after-free from nfnetlink_hook path\nwhen dumping hooks."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: nf_tables: liberar la tabla de flujos después del período de gracia de RCU en caso de error\n\nLlamar a synchronize_rcu() después de desregistrar los hooks de la ruta de error, ya que un hook que ya se refiere a esta tabla de flujos puede estar ya registrado, exponiendo esta tabla de flujos a la ruta de paquetes y al plano de control de nfnetlink_hook.\n\nEsta ruta de error es rara, solo debería ocurrir al alcanzar el número máximo de hooks o al fallar la configuración para la descarga de hardware; simplemente llamar a synchronize_rcu().\n\nExiste una comprobación para hooks de dispositivo ya utilizados por una tabla de flujos diferente que podría resultar en EEXIST en esta etapa tardía. El analizador de hooks puede ser actualizado para realizar esta comprobación antes, para que esta ruta de error realmente se ejercite raramente.\n\nDescubierto por KASAN, reportado como uso después de liberación desde la ruta de nfnetlink_hook al volcar los hooks."
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