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CVE-2026-31685 is an input-validation vulnerability in the Linux kernel netfilter ip6t_eui64 component. The eui64_mt6() function derives a modified EUI-64 from the Ethernet source address and compares it with the low 64 bits of the IPv6 source address. Its MAC-header validation guard rejects invalid headers only when par->fragoff is nonzero. Packets with par->fragoff == 0 can therefore reach eth_hdr(skb) with an invalid MAC header, causing unsafe Ethernet-header access. Specially crafted IPv6 packets can potentially trigger a system crash and denial of service. The flaw was introduced in Linux kernel 2.6.12.
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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.
38 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel Netfilter ip6t_eui64 vulnerability addressed by rejecting invalid MAC headers for all packets. The advisory identifies affected Rocky Linux 10.2 kernel packages and recommends updating them.
A vulnerability addressed by the referenced CentOS 7/TuxCare advisory; no technical flaw details are provided.
A network-exploitable vulnerability affecting Unity Linux systems, rated 9.4 under CVSS v3.0 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H).
A Linux kernel netfilter ip6t_eui64 vulnerability related to improper validation of MAC headers.
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.