Critical Vulnerability in Linux Kernel: AMD Zen IF Poison Error Handling
Summary
CVE-2023-53438: In the Linux kernel, the following vulnerability has been resolved: x86/MCE: Always save CS register on AMD Zen IF Poison errors The Instruction Fetch (IF) units on current AMD Zen-based systems do not guarantee a synchr... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The Linux kernel is the core component of many operating systems, managing hardware resources and providing essential services for software applications. It is known for its stability, performance, and security features. However, vulnerabilities can arise, impacting system integrity and security. This specific vulnerability affects the Linux kernel versions in Debian distributions, particularly concerning AMD Zen-based systems and their handling of Instruction Fetch (IF) unit poison errors.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified related to the handling of poison consumption errors in AMD Zen-based systems. The Instruction Fetch units do not guarantee a synchronous Machine Check Exception (#MC) for these errors, leading to potential misinterpretation of the error context. Specifically, the Code Segment (CS) register may not be accurately saved during these errors, causing the kernel to assume an incorrect context, which can result in unnecessary kernel panics. This vulnerability is critical as it affects system stability and can lead to system crashes.
How To Fix
No fixed version is published for this vulnerability.
Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. It is recommended to apply the available patches as soon as they are released to mitigate the risk.
Conclusion
The CVE-2023-53438 vulnerability in the Linux kernel poses significant risks for systems using AMD Zen-based processors. It is essential to apply the recommended patches to ensure system stability and security. Users should remain vigilant and utilize tools like Vulert to monitor for vulnerabilities in their software.
See every vulnerability recorded for linux →
FAQ
CVE-2023-53438 is a vulnerability in the Linux kernel that affects AMD Zen-based systems, specifically related to the handling of Instruction Fetch unit poison errors.
This vulnerability can lead to incorrect context assumptions during error handling, potentially causing kernel panics and system crashes.
The vulnerability affects various Debian distributions, including Debian 11, 12, 13, and 14, depending on the kernel version.
You can use Vulert, which monitors open-source vulnerabilities in your software. By using the Vulert playground, you can check if your application is affected by this vulnerability without needing to install any software.
While there are no specific workarounds, it is crucial to prioritize updating your kernel to the patched version as soon as possible to mitigate the risks associated with this vulnerability.
Related vulnerabilities
Recent vulnerabilities recorded for linux.
