Critical Security Update for kernel-rt: Important Vulnerabilities Addressed
Summary
ALSA-2026:70403: Important: kernel-rt security, bug fix, and enhancement update. Affects kernel-rt versions < 4.18.0-553.166.1.rt7.507.el8_10. Fixed in 4.18.0-553.166.1.rt7.507.el8_10. How to fix ↓
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Background
The kernel-rt package provides the Real Time Linux Kernel, designed for systems requiring high determinism. It is essential for applications where timing and performance are critical, such as in industrial automation and telecommunications. The kernel-rt package is a variant of the Linux kernel optimized for real-time performance, allowing for fine-tuning of system resources to meet stringent timing requirements.
Vulnerability Detail
This vulnerability report highlights multiple security issues within the kernel-rt package, including a denial of service vulnerability in Bluetooth, potential user-after-free conditions, and various race conditions that could lead to system instability or unauthorized access. The vulnerabilities stem from improper handling of concurrent operations and inadequate validation of input data, which could be exploited by attackers to disrupt services or gain unauthorized access to system resources.
How To Fix
Minimum fixed version
4.18.0-553.166.1.rt7.507.el8_10
This is the first release that contains the fix.
sudo dnf update kernel-rtTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, users can limit the use of Bluetooth functionalities or disable the Bluetooth service until the update is applied. This can be done by executing
sudo systemctl stop bluetooth' in the terminal.
Conclusion
The kernel-rt package has critical vulnerabilities that require immediate attention. Updating to the latest patched version is essential to maintain system security and stability. Users are encouraged to implement the recommended fixes and workarounds while staying informed about future updates.
See every vulnerability recorded for kernel-rt →
FAQ
The kernel-rt package is a Real Time Linux Kernel variant that provides enhanced performance and determinism for applications requiring precise timing.
The update addresses several vulnerabilities, including denial of service, user-after-free conditions, and race conditions in Bluetooth and other kernel components.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software by analyzing the manifest file. Visit Vulert Scanner to check your application without needing to sign up.
If an immediate update is not possible, consider disabling Bluetooth functionalities as a temporary workaround to mitigate potential risks.
It is advisable to regularly check for updates to the kernel-rt package and other critical system components to ensure your system is protected against known vulnerabilities.
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