CVE-2026-31685

CriticalCVSS 9.4/10Last modified Oct 19, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

netfilter: ip6t_eui64: reject invalid MAC header for all packets

`eui64_mt6()` derives a modified EUI-64 from the Ethernet source address and compares it with the low 64 bits of the IPv6 source address.

The existing guard only rejects an invalid MAC header when `par->fragoff != 0`. For packets with `par->fragoff == 0`, `eui64_mt6()` can still reach `eth_hdr(skb)` even when the MAC header is not valid.

Fix this by removing the `par->fragoff != 0` condition so that packets with an invalid MAC header are rejected before accessing `eth_hdr(skb)`.

Metrics

CVSS 3.1 9.4/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

Weakness enumeration

CWE-125

Affected software

No affected versions have been published.

Timeline

Published
Apr 25, 2026
Last modified
Oct 19, 2026
NVD status
Modified

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CVE-2026-31685: Critical severity, CVSS 9.4 | Vulnix