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CVE-2026-23392 is a use-after-free vulnerability in the Linux kernel's Netfilter nf_tables subsystem. During flowtable setup, hooks can become registered before a subsequent operation fails. Error-path cleanup unregisters those hooks but releases the flowtable without waiting for an RCU grace period, allowing outstanding references in packet processing or the nfnetlink_hook control plane to access freed memory. The affected error path can be reached when the maximum hook count is reached, hardware offload setup fails, or a late device-hook conflict check returns EEXIST. KASAN detected the use-after-free while dumping hooks through nfnetlink_hook.
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A use-after-free vulnerability in Linux kernel netfilter nf_tables flowtable error handling. Hooks can retain references to a flowtable released before an RCU grace period completes, exposing freed memory through packet processing and the nfnetlink_hook control plane. The listed CVSS v3 score is 7.8, with local access and low privileges required and potentially high confidentiality, integrity, and availability impact. The fix calls synchronize_rcu() after unregistering hooks on the error path.
A Linux kernel Netfilter nf_tables vulnerability involving flowtable release timing on an error path. The fix delays release until after an RCU grace period; affected Rocky Linux 10.2 kernel packages have updates available.
A use-after-free vulnerability in Linux kernel netfilter nf_tables flowtable error handling. A flowtable can be released while registered hooks still reference it, exposing freed memory to packet processing and the nfnetlink_hook control plane. The fix waits for an RCU grace period after unregistering hooks. The reference assigns a CVSS v3 score of 7.8, with local access and low privileges required.
A use-after-free vulnerability in Linux kernel netfilter nf_tables occurs when an error path releases a flowtable before an RCU grace period has elapsed. Previously registered hooks can still reference the freed flowtable through packet processing or the nfnetlink_hook control plane. The plugin assigns a CVSS v3 score of 7.8, indicating local exploitation requiring low privileges and potentially high confidentiality, integrity, and availability impact. The listed remediation is to update sys-kernel/cchost-kernel-6_12 and related packages to version 19216.220.150 or later.
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