CVE-2026-31685

critical

In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_eui64: reject invalid MAC header for all packets `eui64_mt6()` derives a…

Vendor / product: 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)`.

CVSS

9.4

9.4 (CVSS v3.1)

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

Severity source: NVD CVSS v3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

Timeline (UTC)

Published: 2026-04-25 09:16

Modified: 2026-11-11 23:10

NVD status: Modified

Last synced 3 hours ago

Verified against the source API 2026-11-11 23:13 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

linux / linux_kernel ≥2.6.12.1 <6.6.136, ≥6.7 <6.12.83, ≥6.13 <6.18.24, ≥6.19 <6.19.14, 2.6.12, 7.0

Weakness classification (CWE)

NVD-CWE-noinfo CWE-125

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Patch / mitigation: https://git.kernel.org/stable/c/288138418bef956f8b295751a4536c60f0e89f4a

Patch / mitigation: https://git.kernel.org/stable/c/309ae3e9a51a69699ca94eac5fac5688fa562d55

Patch / mitigation: https://git.kernel.org/stable/c/807d6ee15804df6f01a35c910f09612e858739a6

Patch / mitigation: https://git.kernel.org/stable/c/9eda5478746ef7dc0e4e537b5a5e4b0ca1027091

Patch / mitigation: https://git.kernel.org/stable/c/fdce0b3590f724540795b874b4c8850c90e6b0a8

References

https://git.kernel.org/stable/c/288138418bef956f8b295751a4536c60f0e89f4a 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/309ae3e9a51a69699ca94eac5fac5688fa562d55 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/4d75bc2cd093bf5803edf512c099bfb220fd6459 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/7d6a57411caf54df025860c9b1a82cd42d57a562 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/807d6ee15804df6f01a35c910f09612e858739a6 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/9eda5478746ef7dc0e4e537b5a5e4b0ca1027091 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/d5603591373441fecf9951833d6d873e09320f08 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/fdce0b3590f724540795b874b4c8850c90e6b0a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://cert-portal.siemens.com/productcert/html/ssa-784472.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

Data sources

NVD CVE API 2.0 — fetched 2026-11-11 23:13 UTC · record ↗

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CVE-2026-31685

Affected products

Weakness classification (CWE)

Mitigation & advisories

References

Data sources

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