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Vulnerability record · CVE-2026-31685 · published 25 April 2026

CVE-2026-31685: Linux kernel vulnerability

Linux · Linux Kernel

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)`.

9.4 CVSS 3.1 Critical EPSS 0.62% · top 52.3%
9.4CVSS 3.1 base score
0.62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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)`.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/288138418bef956f8b295751a4536c60f0e89f4a Patch
https://git.kernel.org/stable/c/309ae3e9a51a69699ca94eac5fac5688fa562d55 Patch
https://git.kernel.org/stable/c/4d75bc2cd093bf5803edf512c099bfb220fd6459
https://git.kernel.org/stable/c/7d6a57411caf54df025860c9b1a82cd42d57a562
https://git.kernel.org/stable/c/807d6ee15804df6f01a35c910f09612e858739a6 Patch
https://git.kernel.org/stable/c/9eda5478746ef7dc0e4e537b5a5e4b0ca1027091 Patch
https://git.kernel.org/stable/c/d5603591373441fecf9951833d6d873e09320f08
https://git.kernel.org/stable/c/fdce0b3590f724540795b874b4c8850c90e6b0a8 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31685), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.