CVE-2023-52503 – A race condition vulnerability in the AMD TEE (... (How to Fix)

Q: What is the severity of CVE-2023-52503?

CVE-2023-52503 has a CVSS score of 7.0 (HIGH). A race condition vulnerability in the AMD TEE (Trusted Execution Environment) driver in the Linux kernel allows use-after-free exploitation. This could enable local attackers to escalate privileges or crash the system. Systems running affected Linux kernel versions with AMD TEE enabled are vulnerable.

📋 TL;DR

A race condition vulnerability in the AMD TEE (Trusted Execution Environment) driver in the Linux kernel allows use-after-free exploitation. This could enable local attackers to escalate privileges or crash the system. Systems running affected Linux kernel versions with AMD TEE enabled are vulnerable.

💻 Affected Systems

Products:

Linux kernel with AMD TEE (Trusted Execution Environment) driver

Versions: Linux kernel versions before the fix commits (specific versions vary by distribution)

Operating Systems: Linux distributions with affected kernel versions

Default Config Vulnerable: ⚠️ Yes

Notes: Only vulnerable if AMD TEE functionality is enabled/used. Most systems have TEE disabled by default unless specifically configured for secure computing features.

📦 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 →

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

Local privilege escalation to kernel-level access, potentially leading to full system compromise, data theft, or persistent backdoor installation.

🟠

Likely Case

Kernel panic or system crash causing denial of service, potentially allowing limited information disclosure or privilege escalation in specific scenarios.

🟢

If Mitigated

Minimal impact with proper kernel hardening, SELinux/AppArmor restrictions, and limited user access to TEE interfaces.

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

🏢 Internal Only: MEDIUM - Local attackers or compromised user accounts could exploit this for privilege escalation within the system.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires local access and precise timing to trigger the race condition. No public exploits known as of analysis.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Fixed in Linux kernel stable releases via commits: 1680c82929bc14d706065f123dab77f2f1293116, 1c95574350cd63bc3c5c2fa06658010768f2a0ce, 60c3e7a00db954947c265b55099c21b216f2a05c, da7ce52a2f6c468946195b116615297d3d113a27, f4384b3e54ea813868bb81a861bf5b2406e15d8f

Vendor Advisory: https://git.kernel.org/stable/c/1680c82929bc14d706065f123dab77f2f1293116

Restart Required: Yes

Instructions:

1. Update Linux kernel to patched version from your distribution's repositories. 2. For custom kernels, apply the fix commits from kernel.org. 3. Reboot system to load new kernel.

🔧 Temporary Workarounds

Disable AMD TEE module

linux

Prevent loading of the vulnerable AMD TEE driver if not required

echo 'blacklist amdtee' >> /etc/modprobe.d/blacklist.conf
rmmod amdtee

🧯 If You Can't Patch

Restrict access to TEE interfaces using SELinux/AppArmor policies
Limit local user privileges and implement strict access controls

🔍 How to Verify

Check if Vulnerable:

Check kernel version and if AMD TEE module is loaded: 'uname -r' and 'lsmod | grep amdtee'

Check Version:

uname -r

Verify Fix Applied:

Verify kernel version is after fix commits and check kernel changelog for the specific CVE fix

📡 Detection & Monitoring

Log Indicators:

Kernel oops/panic messages related to amdtee driver
System crash/reboot events without clear cause

Network Indicators:

None - local exploitation only

SIEM Query:

Search for: 'amdtee' OR 'TEE' in kernel logs with error/panic severity

📊 Metadata

CVE ID: CVE-2023-52503

CVSS v3 Score: 7.0 (HIGH)

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

CWE: CWE-416

Published: March 2, 2024

Last Updated: December 10, 2024

🔗 References

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🔗 Related Vulnerabilities

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