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CVE-2025-21826 is an input-validation flaw in the Linux kernel netfilter nf_tables pipapo set-processing path. Concatenated key fields are individually rounded to 32-bit boundaries when pipapo_init() calculates rule width, whereas the set key length is independently aligned to 32 bits. Register-based arithmetic could construct a set whose declared key length and field-length description are inconsistent; for example, a key length of 10 with field lengths of 5 and 4 produces a pipapo width of 12. The fix rejects configurations where the field-length total does not match the set key length.
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No public exploit code observed for this vulnerability.
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Linux kernel nftables key-length validation vulnerability.
Linux kernel nftables field-length validation vulnerability.
A Linux kernel netfilter nf_tables validation flaw where mismatched concatenated-field lengths and an aligned set-key length could be combined, producing an inconsistent pipapo rule width.
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.