Is CVE-2026-31685 actively exploited?

No active exploitation of CVE-2026-31685 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-31685 be exploited remotely?

Yes. CVE-2026-31685 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-31685?

CVE-2026-31685 has a CVSS score of 9.4 (CRITICAL).

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CRITICAL

CVE-2026-31685

Published: April 25, 2026· Updated: Apr 27, 2026

9.4

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:14.0th

Official 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)`.

NVD Source

Technical Analysis

CVE-2026-31685 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 9.4.