Kernel Denial of Service Vulnerability in AlmaLinux Packages
Summary
ALSA-2026:3464: Moderate: kernel security update. Affects bpftool versions < 4.18.0-553.109.1.el8_10. Fixed in 4.18.0-553.109.1.el8_10. How to fix ↓
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Background
The kernel is the core component of any Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. AlmaLinux, a community-driven enterprise-grade Linux distribution, relies on the kernel for stability and performance. The kernel packages in AlmaLinux include various components such as bpftool, kernel-debug, and kernel-tools, which are essential for system operation and development. However, these packages are susceptible to vulnerabilities that can compromise system integrity and availability.
Vulnerability Detail
The vulnerability identified as CVE-2026-23097 is a Denial of Service (DoS) issue stemming from a deadlock in hugetlb folio migration within the Linux kernel. This deadlock can cause the system to become unresponsive, leading to service interruptions. The vulnerability affects multiple packages in AlmaLinux, including the kernel itself, and can be exploited by malicious users to disrupt system operations, making it critical to address promptly.
How To Fix
Minimum fixed version
4.18.0-553.109.1.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 limit access to the affected services or implement resource monitoring to detect unusual behavior that may indicate exploitation attempts. However, the best course of action is to apply the patch as soon as it is available.
Conclusion
The CVE-2026-23097 vulnerability poses a significant risk to AlmaLinux systems, potentially leading to Denial of Service conditions. It is crucial to update the affected packages to the patched version to mitigate this risk. Users are encouraged to monitor their systems and apply the necessary updates promptly.
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FAQ
CVE-2026-23097 is a vulnerability in the Linux kernel that can lead to a Denial of Service due to a deadlock in hugetlb folio migration.
This vulnerability can cause your system to become unresponsive, leading to service interruptions and potential data loss.
The affected packages include kernel, bpftool, kernel-debug, and various kernel-tools in AlmaLinux.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
If you cannot update immediately, consider implementing access restrictions to the affected services and monitor for unusual activity as a temporary measure.
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