Critical Security Update for kernel-rt: Addressing Multiple Vulnerabilities
Summary
ALSA-2026:9135: Important: kernel-rt security update. Affects kernel-rt versions < 4.18.0-553.120.1.rt7.461.el8_10. Fixed in 4.18.0-553.120.1.rt7.461.el8_10. How to fix ↓
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Background
The kernel-rt packages provide the Real Time Linux Kernel, designed for systems requiring high determinism. This kernel variant is optimized for real-time processing, making it essential for applications where timing is critical, such as industrial automation and telecommunications. However, like any software, it is susceptible to vulnerabilities that can compromise system integrity and performance.
Vulnerability Detail
This vulnerability arises from improper memory management in the SCSI subsystem (CVE-2025-68741) and a race condition in the ALSA loopback device (CVE-2026-23191). These issues can lead to system crashes, data corruption, or unauthorized access, posing significant risks to system stability and security. The vulnerabilities were identified in the kernel-rt packages prior to version 4.18.0-553.120.1.rt7.461.el8_10.
How To Fix
Minimum fixed version
4.18.0-553.120.1.rt7.461.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 the ALSA loopback device until the update is applied. However, this is not a permanent solution and should only be used until the system can be updated.
Conclusion
In summary, the kernel-rt packages have critical vulnerabilities that need immediate attention. Updating to the latest patched version is essential to safeguard system integrity and performance. Users are encouraged to monitor their systems and apply updates regularly.
See every vulnerability recorded for kernel-rt →
FAQ
Kernel-rt is a Real Time Linux Kernel package that enables high-performance, deterministic processing for critical applications.
The vulnerabilities can lead to system crashes, data corruption, or unauthorized access, compromising system integrity and performance.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Yes, you can limit access to the affected components or disable the ALSA loopback device as a temporary workaround.
It is recommended to regularly check for updates and apply them promptly to ensure your system is protected against known vulnerabilities.
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