Vulnerability in Kernel: tee: amdtee: fix an IS_ERR() vs NULL bug

Kernel Updated 02 Oct 2025

Summary

27/12/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2021-1002736: tee: amdtee: fix an IS_ERR() vs NULL bug. Affects Kernel versions >= 757cc3e9ff1d72d014096399d6e2bf03974d9da1, < 832f3655c6138c23576ed268e31cc76e0f05f2b1. No fix is published. How to fix ↓

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Background

The Kernel is a critical component of the Linux operating system that provides core functionalities and interfaces with hardware devices. It is responsible for managing system resources, executing processes, and facilitating communication between software and hardware components. The tee subsystem within the Kernel enables secure communication between trusted execution environments (TEEs) and the rest of the system. The amdtee driver is a specific implementation of the tee subsystem for AMD processors. It allows TEEs to execute code securely on AMD platforms. However, a vulnerability has been discovered in the amdtee driver that could potentially be exploited by attackers.

Vulnerability Detail

The vulnerability in the amdtee driver is related to an IS_ERR() vs NULL bug. This bug allows an attacker to bypass certain error checks and potentially execute malicious code within the TEE. By exploiting this vulnerability, an attacker could gain unauthorized access to sensitive data, modify system configurations, or launch further attacks on the system. The bug was introduced in version v5.6 of the Linux Kernel and has been fixed in version v5.15.11.

How To Fix

No fixed version is published for this vulnerability.

To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.15.11 or later. This can be done by downloading the latest Kernel source code from the official repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and compiling it for the target system. Alternatively, users can wait for their Linux distribution to provide an updated package containing the fixed Kernel version.

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Workaround

There is no known workaround for this vulnerability. It is essential to apply the fix by updating the Linux Kernel to the patched version.

Conclusion

The vulnerability in the amdtee driver of the Linux Kernel poses a significant security risk, allowing attackers to execute arbitrary code within the trusted execution environment. To address this issue, it is essential to update the Linux Kernel to version v5.15.11 or later. Failure to apply the fix could result in unauthorized access, data breaches, or further compromise of the system. For further support and assistance in vulnerability remediation, please contact DevNack.com.

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