Critical Security Flaw in Kernel Packages: OverlayFS Access Checks Vulnerability
Summary
ALSA-2026:27811: Important: kernel security update. Affects bpftool versions < 4.18.0-553.137.1.el8_10. Fixed in 4.18.0-553.137.1.el8_10. How to fix ↓
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Background
The kernel packages are fundamental components of any Linux operating system, providing the core functionalities necessary for hardware interaction, process management, and system resource allocation. The affected packages in this vulnerability include bpftool, kernel, and various kernel-related components. These packages are crucial for system stability and performance, making their security paramount.
Vulnerability Detail
The vulnerability, identified as CVE-2026-46054, arises from improper access checks in the OverlayFS implementation of the Linux kernel. Specifically, the issue affects the mmap() and mprotect() functions, which could allow a local user to bypass SELinux protections. This could lead to unauthorized access to sensitive data or system resources, potentially compromising the integrity and confidentiality of the system.
How To Fix
Minimum fixed version
4.18.0-553.137.1.el8_10
This is the first release that contains the fix.
sudo dnf update bpftoolTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can restrict access to the affected functionalities by modifying SELinux policies, although this is not a substitute for applying the patch. It is recommended to consult the SELinux documentation for guidance on implementing such restrictions.
Conclusion
The CVE-2026-46054 vulnerability poses a significant risk to Linux kernel packages, particularly affecting OverlayFS access checks. It is crucial for users to update their systems to the patched version to mitigate potential security threats. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
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FAQ
CVE-2026-46054 is a security vulnerability in the Linux kernel that affects OverlayFS access checks, potentially allowing unauthorized access to system resources.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without requiring any signup.
Failing to address this vulnerability could lead to unauthorized access to sensitive data, system instability, and potential exploitation by malicious users.
Yes, you should update to version 4.18.0-553.137.1.el8_10 or later to ensure that the vulnerability is patched.
Yes, Vulert can monitor a wide range of open-source vulnerabilities in your software by analyzing the manifest file like package-lock.json.
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