CVE-2026-31685

critical · 9.4

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

0.3%

EPSS (exploit prob.)

27th

EPSS percentile

2026-04-25

Published

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

Affected products

Vendor	Product	Affected versions
linux	linux_kernel	>= 2.6.12.1, < 6.6.136
linux	linux_kernel	>= 6.7, < 6.12.83
linux	linux_kernel	>= 6.13, < 6.18.24
linux	linux_kernel	>= 6.19, < 6.19.14
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

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References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-31685