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)`.
References
- www.cve.org/CVERecord ↗
- nvd.nist.gov/vuln/detail/CVE-2026-31685 ↗
- git.kernel.org/stable/c/288138418bef956f8b295751a4536c60f0e89f4a ↗
- git.kernel.org/stable/c/309ae3e9a51a69699ca94eac5fac5688fa562d55 ↗
- git.kernel.org/stable/c/4d75bc2cd093bf5803edf512c099bfb220fd6459 ↗
- git.kernel.org/stable/c/7d6a57411caf54df025860c9b1a82cd42d57a562 ↗
- git.kernel.org/stable/c/807d6ee15804df6f01a35c910f09612e858739a6 ↗
- git.kernel.org/stable/c/9eda5478746ef7dc0e4e537b5a5e4b0ca1027091 ↗
- git.kernel.org/stable/c/d5603591373441fecf9951833d6d873e09320f08 ↗
- git.kernel.org/stable/c/fdce0b3590f724540795b874b4c8850c90e6b0a8 ↗
- cert-portal.siemens.com/productcert/html/ssa-784472.html ↗
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This product uses the NVD API but is not endorsed or certified by the NVD. CVSS scores do not establish exploitation.