CVE-2025-39946 — AI Deep Analysis Summary

🚨 **Essence**: Linux Kernel TLS subsystem fails to abort streams on invalid record headers. 💥 **Consequences**: This leads to **Buffer Overflow**, potentially causing **System Crash** or **Remote Code Execution**.

🛡️ **Root Cause**: Improper input validation in the **net/tls** subsystem. ❌ **Flaw**: The system continues processing even after detecting an **Invalid Record Header**, violating safe memory handling principles.

📦 **Affected**: **Linux Kernel** (Open Source OS by Linux Foundation). 📅 **Context**: Specifically noted in **lts-6.12.48** kCTF instances, but likely affects broader kernel versions using TLS.

👑 **Privileges**: **High Risk** (CVSS 9.8). Attackers can achieve **Full System Compromise** (C:H, I:H, A:H) with **No Authentication** required. 🕵️‍♂️ **Data**: Complete confidentiality and integrity breach.

🔓 **Threshold**: **LOW**. 🌐 **Network**: Attack vector is **Network** (AV:N). 🔑 **Auth**: **None** required (PR:N). 🖱️ **User**: **No interaction** needed (UI:N). Easy to exploit remotely.

💣 **Public Exploit**: **YES**. A PoC exists on GitHub (`farazsth98/exploit-CVE-2025-39946`). ⚠️ **Note**: Works on specific kernels (e.g., lts-6.12.48) but may need offset adjustments for other versions.

🔍 **Self-Check**: Scan for **Linux Kernel** versions with TLS enabled. 📝 **Indicator**: Check if the kernel is running versions prior to the stable patch commits listed in references. Use kernel version scanners.

🩹 **Official Fix**: **YES**. Multiple stable kernel commits are referenced (e.g., `0aeb54ac...`, `b3646214...`). 🔄 **Action**: Update to the latest stable Linux Kernel version containing these fixes.

🚧 **No Patch?**: Disable **TLS** offloading in the kernel if possible. 🛑 **Mitigation**: Apply strict network filtering to prevent untrusted TLS traffic from reaching the vulnerable subsystem.…

🔥 **Urgency**: **CRITICAL**. 🚨 **Priority**: **P0**. With CVSS 9.8 and public exploits, immediate patching is essential to prevent remote code execution and full system takeover.