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CVE-2025-21826 is an input-validation flaw in the Linux kernel netfilter nf_tables subsystem's Pipapo set-processing path. Pipapo initialization rounds each separated concatenated-key field to 32-bit boundaries when calculating rule width, while the total set key length is separately aligned to 32 bits. Register-based arithmetic permitted field-length descriptions whose effective width did not match the declared set key length. For example, a set key length of 10 combined with field lengths of 5 and 4 produces a Pipapo rule width of 12. The fix rejects field-length totals that mismatch the set key length.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel nftables field-length and set-key-length validation flaw.
A Linux kernel netfilter/nf_tables pipapo set-key length validation flaw caused by accepting mismatched field-length descriptions and aligned set key lengths. The affected Google COS package is sys-kernel/csql-kernel-6_1 before version 17800.519.1.
Linux kernel nftables key-length validation vulnerability.
Linux kernel nftables field-length validation vulnerability.
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.