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)`.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 9eda5478746ef7dc0e4e537b5a5e4b0ca1027091
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 807d6ee15804df6f01a35c910f09612e858739a6
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 309ae3e9a51a69699ca94eac5fac5688fa562d55
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < fdce0b3590f724540795b874b4c8850c90e6b0a8
Linux Linux affected
Version Status Constraints
2.6.12 affected —
0 unaffected < 2.6.12
6.12.83 unaffected ≤ 6.12.*
6.18.24 unaffected ≤ 6.18.*
6.19.14 unaffected ≤ 6.19.*
7.0 unaffected ≤ *

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Fixes

Solution

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Workaround

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References
Link Providers
https://git.kernel.org/stable/c/309ae3e9a51a69699ca94eac5fac5688fa562d55 cve-icon cve-icon
https://git.kernel.org/stable/c/807d6ee15804df6f01a35c910f09612e858739a6 cve-icon cve-icon
https://git.kernel.org/stable/c/9eda5478746ef7dc0e4e537b5a5e4b0ca1027091 cve-icon cve-icon
https://git.kernel.org/stable/c/fdce0b3590f724540795b874b4c8850c90e6b0a8 cve-icon cve-icon
History

Sat, 25 Apr 2026 09:00:00 +0000

Type Values Removed Values Added
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)`.
Title netfilter: ip6t_eui64: reject invalid MAC header for all packets
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-04-25T08:47:02.857Z

Reserved: 2026-03-09T15:48:24.131Z

Link: CVE-2026-31685

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-04-25T09:16:02.273

Modified: 2026-04-25T09:16:02.273

Link: CVE-2026-31685

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses

No weakness.