CVE-2024-57793
📋 TL;DR
This vulnerability in the Linux kernel's TDX guest module could allow an untrusted hypervisor to cause memory decryption failures, potentially exposing sensitive data. It affects Confidential Computing (CoCo) virtual machines running on Intel TDX platforms. The issue occurs when the host triggers unrecoverable errors during memory decryption operations.
💻 Affected Systems
- Linux kernel
📦 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 →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
Sensitive encrypted guest memory could be leaked to the untrusted hypervisor, potentially exposing cryptographic keys, passwords, or other confidential data.
Likely Case
Memory corruption or information disclosure within the guest VM, potentially leading to privilege escalation or data leakage.
If Mitigated
With proper isolation controls and updated kernels, the risk is limited to specific CoCo VM configurations.
🎯 Exploit Status
Exploitation requires control of the hypervisor and specific TDX guest configurations
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions with commit 1429ae7b7d4759a1e362456b8911c701bae655b4 or later
Vendor Advisory: https://git.kernel.org/stable/c/1429ae7b7d4759a1e362456b8911c701bae655b4
Restart Required: Yes
Instructions:
1. Update Linux kernel to version containing the fix commit 2. Reboot the system 3. Verify the patch is applied
🔧 Temporary Workarounds
Disable TDX guest support
linuxDisable Intel TDX guest functionality if not required
modprobe -r tdx_guest
echo 'blacklist tdx_guest' >> /etc/modprobe.d/blacklist.conf
🧯 If You Can't Patch
- Isolate TDX guest VMs from untrusted hypervisors
- Implement additional monitoring for memory access patterns in CoCo environments
🔍 How to Verify
Check if Vulnerable:
Check if TDX guest module is loaded and kernel version is vulnerable: lsmod | grep tdx_guest && uname -rCheck Version:
uname -rVerify Fix Applied:
Verify kernel contains the fix commit: grep -q '1429ae7b7d4759a1e362456b8911c701bae655b4' /proc/version_signature📡 Detection & Monitoring
Log Indicators:
- Kernel warnings about set_memory_decrypted failures
- TDX guest module error messages
SIEM Query:
source="kernel" AND ("tdx_guest" OR "set_memory_decrypted") AND ("error" OR "warning" OR "fail")