Critical Security Update for Real Time Linux Kernel: kernel-rt Vulnerability
Summary
ALSA-2026:49213: Important: kernel-rt security update. Affects kernel-rt versions < 4.18.0-553.150.1.rt7.491.el8_10. Fixed in 4.18.0-553.150.1.rt7.491.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 and low latency. This package is essential for applications in industries such as telecommunications, automotive, and robotics, where timing precision is critical. The kernel-rt package allows for fine-tuning of system performance, but it is also susceptible to security vulnerabilities that can compromise system integrity and performance.
Vulnerability Detail
The vulnerability stems from multiple security flaws within the kernel-rt packages, including a missing netlink_ns_capable() check for peer netns, unsafe access to master conntrack in netfilter, and a user-after-free (UAF) condition due to a missing handler for TC_ACT_CONSUMED in the tcf_qevent_handle function. These vulnerabilities can lead to unauthorized access, privilege escalation, and potential denial of service, posing significant risks to systems relying on the kernel-rt package.
How To Fix
Minimum fixed version
4.18.0-553.150.1.rt7.491.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
Currently, there are no specific workarounds provided for this vulnerability. The best course of action is to apply the security update as soon as possible.
Conclusion
The kernel-rt security update addresses critical vulnerabilities that could compromise system integrity and performance. It is essential to update to the latest patched version to mitigate risks associated with these vulnerabilities. Regular monitoring and updates are key to maintaining system security.
See every vulnerability recorded for kernel-rt →
FAQ
The kernel-rt package is a Real Time Linux Kernel that provides low-latency performance for applications requiring high determinism.
The risks include unauthorized access, privilege escalation, and potential denial of service, which can severely impact system operations.
You can use Vulert, which monitors open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without needing to sign up.
While there are no specific workarounds, it is crucial to prioritize updating the affected packages as soon as possible.
It is recommended to regularly check for updates, ideally weekly or monthly, to ensure that your system remains secure against known vulnerabilities.
Related vulnerabilities
Recent vulnerabilities recorded for kernel-rt.
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