EUVD Vulnerability Catalog
EUVD-2026-25652
Severity: CRITICAL
Base Score: 9.4
CVSS Version: 3.1
Vulnerability 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 Vector Analysis
Below is the complete, human-readable breakdown of the CVSS metric string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
▪
Attack Vector (AV): Network
▪
Attack Complexity (AC): Low
▪
Privileges Required (PR): None
▪
User Interaction (UI): None
▪
Scope (S): Unchanged
▪
Confidentiality Impact (C): High
▪
Integrity Impact (I): Low
▪
Availability Impact (A): High
Affected Vendors & Systems
Vendor
Linux
References & Advisory Links
- https://git.kernel.org/stable/c/4d75bc2cd093bf5803edf512c099bfb220fd6459
- https://git.kernel.org/stable/c/7d6a57411caf54df025860c9b1a82cd42d57a562
- https://git.kernel.org/stable/c/d5603591373441fecf9951833d6d873e09320f08
- https://git.kernel.org/stable/c/288138418bef956f8b295751a4536c60f0e89f4a
- https://git.kernel.org/stable/c/9eda5478746ef7dc0e4e537b5a5e4b0ca1027091
- https://git.kernel.org/stable/c/807d6ee15804df6f01a35c910f09612e858739a6
- https://git.kernel.org/stable/c/309ae3e9a51a69699ca94eac5fac5688fa562d55
- https://git.kernel.org/stable/c/fdce0b3590f724540795b874b4c8850c90e6b0a8
Metadata Profile
Database Authority
European Union Agency for Cybersecurity (ENISA) EUVD
Assigner
Linux
EPSS Probability
0.39
Known Aliases
GHSA-hf2p-g3jq-w2mx
CVE-2026-31685
Published On
2026-04-25
Last Updated
2026-10-19