CVE-2024-47727 – This vulnerability in the Linux kernel's TDX (T... (How to Fix)

Q: What is the severity of CVE-2024-47727?

CVE-2024-47727 has a CVSS score of 7.8 (HIGH). This vulnerability in the Linux kernel's TDX (Trust Domain Extensions) implementation allows userspace processes to trick the kernel into performing MMIO (Memory-Mapped I/O) operations on their behalf. Attackers could potentially read or write to privileged memory regions, leading to information disclosure or privilege escalation. Systems using Intel TDX technology with affected Linux kernel versions are vulnerable.

📋 TL;DR

This vulnerability in the Linux kernel's TDX (Trust Domain Extensions) implementation allows userspace processes to trick the kernel into performing MMIO (Memory-Mapped I/O) operations on their behalf. Attackers could potentially read or write to privileged memory regions, leading to information disclosure or privilege escalation. Systems using Intel TDX technology with affected Linux kernel versions are vulnerable.

💻 Affected Systems

Products:

Linux kernel

Versions: Kernel versions with TDX support before the fix commits (specific versions vary by distribution)

Operating Systems: Linux distributions with TDX-enabled kernels

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects systems with Intel TDX technology enabled. Most cloud/enterprise environments using TDX for confidential computing are vulnerable.

📦 What is this software?

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

Linux Kernel by Linux

The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...

Learn more about Linux Kernel →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Full system compromise through privilege escalation to kernel mode, allowing arbitrary code execution, data theft, or system disruption.

🟠

Likely Case

Information disclosure from kernel memory or controlled data corruption, potentially leading to privilege escalation in multi-step attacks.

🟢

If Mitigated

Limited impact due to existing kernel security mechanisms like KASLR, SMEP, and SMAP reducing exploit reliability.

🌐 Internet-Facing: LOW - Requires local access to exploit; not directly exploitable over network.

🏢 Internal Only: HIGH - Local attackers with user privileges can potentially escalate to kernel privileges.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Requires local user access and knowledge of MMIO addresses. Exploit reliability depends on system configuration and memory layout.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Fixed in kernel commits: 18ecd5b74682839e7cdafb7cd1ec106df7baa18c, 25703a3c980e21548774eea8c8a87a75c5c8f58c, 4c0c5dcb5471de5fc8f0a1c4980e5815339e1cee, bca2e29f7e26ce7c3522f8b324c0bd85612f68e3, d4fc4d01471528da8a9797a065982e05090e1d81

Vendor Advisory: https://git.kernel.org/stable/c/18ecd5b74682839e7cdafb7cd1ec106df7baa18c

Restart Required: Yes

Instructions:

1. Update to patched kernel version from your distribution vendor. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.

🔧 Temporary Workarounds

Disable TDX

linux

Disable Intel TDX technology if not required for your workload

Add 'tdx=off' to kernel boot parameters in GRUB configuration

🧯 If You Can't Patch

Restrict local user access to systems using TDX technology
Implement strict privilege separation and limit users to minimal required permissions

🔍 How to Verify

Check if Vulnerable:

Check if TDX is enabled: 'cat /proc/cmdline | grep tdx' and check kernel version against patched versions

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version includes fix commits or is newer than vulnerable versions

📡 Detection & Monitoring

Log Indicators:

Kernel logs showing #VE (Virtualization Exception) errors
Unexpected MMIO access attempts in kernel logs

Network Indicators:

None - local exploitation only

SIEM Query:

source="kernel" AND ("#VE" OR "MMIO" OR "tdx") AND severity=ERROR

📊 Metadata

CVE ID: CVE-2024-47727

CVSS v3 Score: 7.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-754

Published: October 21, 2024

Last Updated: November 3, 2025

🔗 References

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🔗 Related Vulnerabilities

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