Critical Security Update for Real Time Linux Kernel: kernel-rt Vulnerability
Summary
ALSA-2026:21745: Important: kernel-rt security update. Affects kernel-rt versions < 4.18.0-553.126.1.rt7.467.el8_10. Fixed in 4.18.0-553.126.1.rt7.467.el8_10. How to fix ↓
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Background
The kernel-rt package provides a Real Time Linux Kernel designed for systems requiring high determinism. It is essential for applications where timing is critical, such as industrial automation and real-time data processing. The kernel-rt package is part of the AlmaLinux ecosystem and is tailored for performance and reliability in time-sensitive environments.
Vulnerability Detail
The kernel-rt package has been identified with multiple vulnerabilities, including use-after-free issues, buffer overflows, and denial of service risks. These vulnerabilities can lead to system crashes, unauthorized access, or privilege escalation, posing significant security threats. The vulnerabilities stem from improper handling of memory and data structures within the kernel, which can be exploited by malicious actors to compromise system integrity.
How To Fix
Minimum fixed version
4.18.0-553.126.1.rt7.467.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 access to the affected services or disable specific kernel features that are known to be vulnerable until the system can be updated. However, this is not a permanent solution and should only be used as a stopgap.
Conclusion
The kernel-rt package is critical for real-time applications, but it has been found to contain several vulnerabilities that pose serious security risks. Users are strongly advised to update to the latest patched version to mitigate these risks. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
See every vulnerability recorded for kernel-rt →
FAQ
The kernel-rt package is a Real Time Linux Kernel designed for applications that require precise timing and high reliability.
The vulnerabilities include use-after-free errors, buffer overflows, and denial of service risks, which can lead to system instability and security breaches.
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.
If immediate updates are not possible, consider implementing workarounds such as limiting access to vulnerable services or disabling specific kernel features until the update can be applied.
Yes, exploitation of these vulnerabilities could lead to data corruption or loss, as well as unauthorized access to sensitive information.
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