CVE-2026-31685 — AI Deep Analysis Summary

🚨 **Essence**: A critical flaw in the Linux Kernel's `ip6t_eui64` module. The MAC header validity check is broken.…

🛡️ **Root Cause**: Logic error in `ip6t_eui64`. The condition checking the validity of the MAC header is incorrect. ❌ This allows the kernel to process malformed or invalid data structures.

🖥️ **Affected**: All Linux distributions using the vulnerable Linux Kernel version. 📦 **Vendor**: Linux (Linux Foundation). ⚠️ Specific versions not listed in data, but applies to the kernel component directly.

🔓 **Privileges**: High impact. CVSS indicates **High Confidentiality**, **High Availability**, and **Low Integrity** impact. 💾 **Data**: Potential for sensitive data exposure or denial of service (crash/hang).

⚡ **Threshold**: **LOW**. CVSS Vector: `AV:N/AC:L/PR:N/UI:N`. 🌐 **Network**: Remote. 🚫 **Auth**: None required. 🤝 **User Interaction**: None. Easy to exploit.

🚫 **Public Exploit**: **No**. The `pocs` field is empty. 🕵️‍♂️ **Status**: No public Proof-of-Concept (PoC) or wild exploitation observed yet.

🔍 **Check**: Scan for Linux Kernel versions affected by `ip6t_eui64` issues. 📡 **Features**: Look for IPv6 packet processing modules. Use kernel version fingerprinting tools.

✅ **Fixed**: **Yes**. Official patches are available via Linux Kernel Stable repositories. 🔗 **Links**: Multiple commits (e.g., `309ae3e`, `2881384`) indicate fixes are merged.

🛠️ **Workaround**: If patching is delayed, disable unnecessary IPv6 modules or restrict network access to the affected kernel interfaces. 🚧 **Mitigation**: Apply firewall rules to filter malformed IPv6 packets.

🔥 **Urgency**: **HIGH**. CVSS Score is high (implied by H/H/L). 🚀 **Priority**: Patch immediately. Remote, unauthenticated exploitation makes this a critical security risk.