Critical Security Update for kernel-rt: Denial of Service and Multiple Vulnerabilities Resolved
Summary
ALSA-2026:66324: Important: kernel-rt security, bug fix, and enhancement update. Affects kernel-rt versions < 4.18.0-553.162.1.rt7.503.el8_10. Fixed in 4.18.0-553.162.1.rt7.503.el8_10. How to fix ↓
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Background
The kernel-rt package provides the Real Time Linux Kernel, which is essential for systems requiring high determinism. It enables fine-tuning for performance-critical applications, ensuring that tasks are executed within strict timing constraints. However, vulnerabilities in this package can lead to severe security risks, including Denial of Service (DoS) attacks and potential data breaches.
Vulnerability Detail
This vulnerability arises from multiple issues within the kernel-rt package, including improper command handling in the qla2xxx SCSI driver, which can lead to Denial of Service (CVE-2025-68745). Other vulnerabilities include buffer overflows and race conditions in various components, which can be exploited to crash the system or execute arbitrary code. The ramifications of these vulnerabilities are significant, as they can compromise system integrity and availability, affecting critical applications relying on real-time processing.
How To Fix
Minimum fixed version
4.18.0-553.162.1.rt7.503.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 access to the affected components or disable specific features that utilize the vulnerable drivers until the update is applied. However, this is not a permanent solution and should only be used until the patch is implemented.
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 integrity. Users are encouraged to monitor their systems and apply the necessary updates promptly.
See every vulnerability recorded for kernel-rt →
FAQ
The kernel-rt package provides a Real Time Linux Kernel, designed for applications that require precise timing and high performance.
The update addresses multiple vulnerabilities, including Denial of Service, buffer overflows, and race conditions in various kernel components.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If an immediate update is not possible, consider implementing temporary workarounds, such as limiting access to vulnerable components.
For detailed information about the vulnerabilities, refer to the CVE pages listed in the advisory or consult the official documentation of the kernel-rt package.
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