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CVE-2026-23392 is a use-after-free vulnerability in the Linux kernel netfilter nf_tables flowtable setup error path. When flowtable hook registration subsequently fails, hooks may already have exposed the flowtable to packet processing and the nfnetlink_hook control plane. The vulnerable cleanup path unregisters hooks and releases the flowtable without waiting for pre-existing RCU readers to complete. KASAN detected use-after-free access through the nfnetlink_hook hook-dump path. The fix invokes synchronize_rcu() after hook unregistration, deferring flowtable release until the RCU grace period has elapsed.
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A Linux kernel netfilter nf_tables use-after-free vulnerability caused by releasing a flowtable too early on an error path before an RCU grace period, potentially exposing the flowtable to packet path and nfnetlink_hook control plane access.
Linux kernel netfilter/nf_tables vulnerability related to flowtable release after RCU grace period on error.
Linux kernel netfilter nf_tables vulnerability related to flowtable release after RCU grace period on error.
A Linux kernel netfilter nf_tables vulnerability involving flowtable release timing after an error.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.