CVE-2026-31685CRITICAL 9.4EPSS p25.4%

CVE-2026-31685CVE-2026-31685

linux / linux_kernel

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)`.

Scoring

CVSS 3.19.4 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
EPSS0.34% probability of exploitation · percentile 25.4% · 2026-06-18T12:00:27Z
Published2026-04-25
Last modified2026-06-01

References

  1. https://git.kernel.org/stable/c/288138418bef956f8b295751a4536c60f0e89f4a
  2. https://git.kernel.org/stable/c/309ae3e9a51a69699ca94eac5fac5688fa562d55
  3. https://git.kernel.org/stable/c/807d6ee15804df6f01a35c910f09612e858739a6
  4. https://git.kernel.org/stable/c/9eda5478746ef7dc0e4e537b5a5e4b0ca1027091
  5. https://git.kernel.org/stable/c/fdce0b3590f724540795b874b4c8850c90e6b0a8

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.