Moderate Security Vulnerability in kernel-rt Package: Event FIFO Reset Race Issue
Summary
ALSA-2026:52761: Moderate: kernel-rt security update. Affects kernel-rt versions < 4.18.0-553.154.1.rt7.495.el8_10. Fixed in 4.18.0-553.154.1.rt7.495.el8_10. How to fix ↓
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Background
The kernel-rt package provides a Real Time Linux Kernel designed for systems that require high determinism. This package is crucial for applications where timing and performance are critical, such as in industrial automation, telecommunications, and real-time data processing. The kernel-rt package allows for fine-tuning of system performance, ensuring that tasks are executed within strict timing constraints. However, it is essential to maintain the security of this package to prevent potential exploits that could compromise system integrity.
Vulnerability Detail
The vulnerability identified as CVE-2026-64496 pertains to a race condition in the event FIFO reset mechanism within the kernel-rt package. This issue arises when multiple processes attempt to reset the event FIFO simultaneously, leading to unpredictable behavior and potential system crashes. If exploited, this vulnerability could allow an attacker to execute arbitrary code or cause a denial of service, significantly impacting system reliability and security. The vulnerability affects various components of the kernel-rt package, including core, debug, and development modules.
How To Fix
Minimum fixed version
4.18.0-553.154.1.rt7.495.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 number of processes that access the event FIFO simultaneously. This can be done by implementing a locking mechanism in the application code to ensure that only one process can reset the FIFO at a time. However, this is not a permanent solution and updating the package is strongly advised.
Conclusion
The kernel-rt package has a moderate security vulnerability (CVE-2026-64496) that can lead to significant issues if not addressed. Users are encouraged to update to the patched version to mitigate risks. Implementing workarounds can provide temporary relief, but the best course of action is to apply the necessary updates promptly.
See every vulnerability recorded for kernel-rt →
FAQ
CVE-2026-64496 is a security vulnerability in the kernel-rt package that involves a race condition in the event FIFO reset mechanism.
Exploitation of this vulnerability could lead to arbitrary code execution or denial of service, impacting system reliability and security.
If immediate updates are not possible, consider implementing a locking mechanism in your application to limit simultaneous access to the event FIFO.
More details can be found on the CVE page associated with CVE-2026-64496, which provides in-depth information about the vulnerability and its implications.
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