cve-2026-31685

About this tag
CVE-2026-31685 is a Linux kernel vulnerability in the ip6t_eui64 netfilter module, which compares an Ethernet-derived EUI-64 identifier with the lower 64 bits of an IPv6 source address. The flaw involves a missing guard condition that can cause the kernel to attempt reading an invalid MAC header from malformed packets. The fix is a one-line logic change to reject such packets before header parsing. This tag covers discussions about the vulnerability, its impact on packet parsing, and the patch. While the vulnerability is in Linux, it is relevant to Windows users running virtual machines or containers that rely on Linux networking components.

  1. CVE-2026-31685 Fix: Linux ip6t_eui64 Drops Invalid IPv6 MAC Headers

    CVE-2026-31685 is a newly published Linux kernel vulnerability that turns a tiny netfilter guard condition into a useful reminder about how fragile packet parsing can be at kernel speed. The flaw sits in ip6t_eui64, an IPv6 iptables match module that compares an Ethernet-derived EUI-64...
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    • cve-2026-31685 ipv6 security linux kernel netfilter iptables
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    • Forum: Security Alerts