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CVE-2026-43329 affects Linux kernel netfilter flowtable hardware-offload action construction. The prior per-flow action limit of 16 is insufficient for certain IPv6 configurations: Ethernet address mangling, SNAT, DNAT, QinQ/double-VLAN operations, and redirect can require 17 actions, with tunnel actions also supported. Payload modifications operate on 32-bit words, requiring four actions to mangle an IPv6 address. The flaw resulted from insufficient maximum-action validation at flow_action_entry_next() call sites.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
37 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A kernel netfilter flowtable vulnerability involving insufficient checking of the maximum number of actions.
A Linux kernel netfilter flowtable vulnerability related to insufficient checking of the maximum number of actions.
A Linux kernel netfilter flowtable vulnerability involving insufficient checking of the maximum number of actions.
Linux kernel vulnerability in netfilter flowtable related to strict checking for the maximum number of actions.
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.