Critical Security Update for kernel-rt: Addressing Multiple Use-After-Free Vulnerabilities
Summary
ALSA-2026:3110: Important: kernel-rt security update. Affects kernel-rt versions < 4.18.0-553.107.1.rt7.448.el8_10. Fixed in 4.18.0-553.107.1.rt7.448.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 and low latency. It is essential for applications where timing is critical, such as in industrial automation, telecommunications, and real-time data processing. However, recent vulnerabilities have been identified that could compromise system security and stability.
Vulnerability Detail
The kernel-rt package has been found to contain multiple use-after-free vulnerabilities, which can lead to privilege escalation and system instability. These vulnerabilities stem from improper memory management in various components of the kernel, including the page pool, bridge multicast, and multicast route statistics. Exploiting these vulnerabilities could allow an attacker to execute arbitrary code with elevated privileges, potentially compromising the entire system.
How To Fix
Minimum fixed version
4.18.0-553.107.1.rt7.448.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 components or disable specific features that utilize the vulnerable functionalities. However, the best course of action is to apply the patch as soon as possible.
Conclusion
The kernel-rt package has critical vulnerabilities that require immediate attention. Updating to the latest patched version is essential to ensure system security and stability. Users are encouraged to monitor their systems for vulnerabilities using tools like Vulert and to stay informed about security updates.
See every vulnerability recorded for kernel-rt →
FAQ
A use-after-free vulnerability occurs when a program continues to use a memory location after it has been freed, potentially allowing an attacker to manipulate the memory and execute arbitrary code.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. By uploading your manifest file, you can check if your application is affected by this vulnerability.
Failing to update the kernel-rt package could leave your system vulnerable to exploitation, leading to potential data breaches, unauthorized access, and system instability.
While the best solution is to apply the patch, you can limit access to the affected components or disable certain features temporarily to reduce risk.
For detailed information about the vulnerabilities, including CVSS scores and acknowledgments, refer to the CVE pages listed in the related section of the advisory.
Related vulnerabilities
Recent vulnerabilities recorded for kernel-rt.
