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CVE-2026-31685 is a denial-of-service vulnerability in the Linux kernel netfilter ip6t_eui64 component. The flaw is in the eui64_mt6() function, which derives a modified EUI-64 from the Ethernet source address and compares it with the low 64 bits of the IPv6 source address. The vulnerable logic only rejected an invalid MAC header when the fragment offset condition indicated a nonzero offset. As a result, packets with a zero fragment offset could bypass the guard and still reach Ethernet header access on an invalid MAC header. The fix removes that fragment-offset condition so that packets with invalid MAC headers are rejected before eth_hdr(skb) is accessed. The issue affects Linux kernel code present since 2.6.12.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
28 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel netfilter ip6t_eui64 vulnerability related to improper validation of MAC headers.
Linux kernel netfilter ip6t_eui64 vulnerability related to invalid MAC header handling.
Linux kernel netfilter vulnerability related to rejecting invalid MAC headers in ip6t_eui64.
A Linux kernel netfilter vulnerability in ip6t_eui64 involving invalid MAC header handling.
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.