Critical Vulnerability in Linux Kernel: s390/mm in_atomic() Handling Flaw
Summary
CVE-2025-38359: In the Linux kernel, the following vulnerability has been resolved: s390/mm: Fix in_atomic() handling in do_secure_storage_access() Kernel user spaces accesses to not exported pages in atomic context incorrectly try to r... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware and software interaction. It is known for its robustness, flexibility, and extensive support for various hardware architectures. However, vulnerabilities can arise, such as the one identified in the s390 architecture, which affects the handling of secure storage access in atomic contexts.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the s390 architecture related to the handling of secure storage access in atomic contexts. This flaw allows kernel user space accesses to non-exported pages to incorrectly attempt to resolve page faults, leading to potential system instability. The issue manifests as a bug where sleeping functions are called from an invalid context, which can result in system crashes or unexpected behavior. The vulnerability is particularly concerning as it can be exploited in environments where secure storage access is critical.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can avoid accessing secure storage in atomic contexts. This may involve modifying application logic to ensure that such accesses are performed in process context, allowing for proper page fault resolution.
Conclusion
The vulnerability CVE-2025-38359 in the Linux kernel poses a significant risk, particularly for systems utilizing the s390 architecture. It is crucial for users to apply the necessary updates to mitigate potential impacts. Understanding the nature of this vulnerability and implementing the recommended fixes or workarounds will help maintain system stability and security.
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FAQ
CVE-2025-38359 is a vulnerability in the Linux kernel affecting the s390 architecture, specifically related to the handling of secure storage access in atomic contexts.
This vulnerability can lead to system instability, crashes, or unexpected behavior when accessing secure storage in atomic contexts.
Yes, a patch is available. Users are advised to update their Linux package to the latest version that addresses this vulnerability.
If you cannot apply the patch immediately, consider implementing a workaround by avoiding secure storage access in atomic contexts.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. By uploading your manifest file like package-lock.json to the Vulert playground, you can check if your application is affected by CVE-2025-38359.
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