Critical Security Update for Real Time Linux Kernel: kernel-rt Vulnerability
Summary
ALSA-2026:64770: Important: kernel-rt security update. Affects kernel-rt versions < 4.18.0-553.160.1.rt7.501.el8_10. Fixed in 4.18.0-553.160.1.rt7.501.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 and responsiveness are critical, such as in industrial automation, telecommunications, and real-time data processing. This package allows fine-tuning of the kernel to meet stringent performance requirements, making it a vital component in specialized computing environments.
Vulnerability Detail
The vulnerability identified in the kernel-rt package stems from multiple security flaws, including improper handling of requests in the crypto subsystem (CVE-2026-43493) and issues in the netfilter subsystem that could lead to potential denial of service or data corruption. The ramifications of these vulnerabilities can be severe, potentially allowing unauthorized access or manipulation of sensitive data, impacting system stability and security. The vulnerabilities are rooted in the kernel's handling of network traffic and cryptographic operations, which are critical for maintaining system integrity and confidentiality.
How To Fix
Minimum fixed version
4.18.0-553.160.1.rt7.501.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 workaround, users can limit the exposure of their systems by implementing stricter firewall rules to mitigate potential attacks while awaiting the patch. Additionally, disabling specific features related to the affected subsystems may reduce risk until the update is applied.
Conclusion
The kernel-rt package is critical for systems requiring real-time performance. The identified vulnerabilities pose significant risks, and it is crucial for users to update to the patched version to ensure system security. By following the outlined steps and utilizing tools like Vulert, users can effectively manage and mitigate potential threats.
See every vulnerability recorded for kernel-rt →
FAQ
The kernel-rt package provides a Real Time Linux Kernel optimized for applications requiring high determinism and low latency.
Failure to update may leave systems vulnerable to exploitation, potentially leading to unauthorized access, data loss, or system instability.
You can use Vulert, which monitors open-source vulnerabilities in your software. By utilizing the manifest file like package-lock.json, it alerts you in real-time. You can also check your application using the Vulert playground at Vulert Scanner without signing up.
Yes, implementing stricter firewall rules and disabling certain features related to the affected subsystems can help mitigate risks temporarily.
Detailed information about the vulnerabilities can be found on the respective CVE pages linked in the advisory.
Related vulnerabilities
Recent vulnerabilities recorded for kernel-rt.
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