CVE-2026-31436 — AI Deep Analysis Summary

🚨 **Essence**: A critical flaw in Linux Kernel's `dmaengine idxd` subsystem. <br>🔥 **Consequences**: The `llist_abort_desc()` function may incorrectly handle descriptor completion.…

🛠️ **Root Cause**: Logic error in the `llist_abort_desc()` function within the `dmaengine idxd` driver. <br>❌ **Flaw**: Improper handling of descriptor states during abort operations.…

🐧 **Vendor**: Linux (Linux Foundation). <br>📦 **Product**: Linux Kernel. <br>📅 **Affected**: All versions prior to the fix commits listed in references.…

👑 **Privileges**: Potential for **Local Privilege Escalation** or **Remote Code Execution** (via crash/DoS). <br>📊 **Data**: Risk of **Data Corruption** due to double completion or descriptor leaks.…

⚡ **Threshold**: **Low**. <br>🔓 **Auth**: `PR:N` (No Privileges Required). <br>🖱️ **UI**: `UI:N` (User Interaction Not Required). <br>🌐 **Access**: `AV:N` (Network Accessible) & `AC:L` (Low Complexity).…

🕵️ **Public Exploit**: **No**. <br>📄 **PoC**: The `pocs` field is empty in the provided data.…

🔍 **Self-Check**: <br>1. Check Kernel Version against patched commits. <br>2. Verify if `idxd` driver is loaded (`lsmod | grep idxd`). <br>3. Monitor for kernel panics related to DMA engine. <br>4.…

✅ **Fixed**: **Yes**. <br>🩹 **Patch**: Multiple stable kernel commits have addressed this (see references).…

🛡️ **Workaround (No Patch)**: <br>1. **Disable** the `idxd` driver if not strictly needed (`modprobe -r idxd`). <br>2. **Isolate** systems using this hardware from untrusted networks. <br>3.…

🔴 **Urgency**: **HIGH**. <br>⏳ **Priority**: Immediate action required. <br>📉 **Reason**: CVSS Vector is `H:H:H` (High/High/High).…