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CVE-2026-23231 is a use-after-free vulnerability in the Linux kernel netfilter nf_tables subsystem. The nf_tables_addchain() function publishes a chain through nft_chain_add() before registering its hooks. If nf_tables_register_hook() fails, the error path removes and destroys the chain without waiting for an RCU grace period. Concurrent nf_tables_dump_chains() readers can therefore access the freed chain. A second condition affects NFPROTO_INET: IPv4 hook installation can succeed transiently before IPv6 registration fails, allowing in-flight nft_do_chain() packet evaluation to dereference freed chain data. The fix waits for outstanding RCU readers before destroying the chain.
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A Linux kernel Netfilter nf_tables use-after-free vulnerability triggered when hook registration fails after a chain has been published. Concurrent control-plane readers or packets using a transient IPv4 hook may access freed chain memory. The reference assigns a CVSS v3 base score of 7.8, with local access, low privileges, and potentially high confidentiality, integrity, and availability impact.
A Linux kernel netfilter/nf_tables use-after-free vulnerability caused by freeing a chain after failed hook registration before RCU readers and in-flight packet processing have completed. It affects Google COS packages sys-kernel/csql-kernel-6_1 and sys-kernel/lakitu-kernel-6_1 prior to version 18244.582.42.
A vulnerability addressed by the CIQ LTS 8.6 kernel security-update advisory.
Unknown
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Cross-references every affected SKU, including bundled OEM variants.
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