Moderate Security Vulnerability in kernel-rt Package: CVE-2025-71085 and CVE-2026-23001

kernel-rt Updated 13 Mar 2026

Summary

09/03/2026

Disclosed on

N/A

Severity

Yes i

Fix available

Unrated

Severity

Not published

CVSS Score

ALSA-2026:3964: Moderate: kernel-rt security update. Affects kernel-rt versions < 4.18.0-553.111.1.rt7.452.el8_10. Fixed in 4.18.0-553.111.1.rt7.452.el8_10. How to fix ↓

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Background

The kernel-rt package provides the Real Time Linux Kernel, which is designed for systems that require high determinism. It allows for fine-tuning of system performance, making it suitable for applications where timing is critical. This package is part of the AlmaLinux ecosystem, specifically version 8, and is essential for real-time applications.

Vulnerability Detail

The vulnerability stems from two main issues: a BUG() in the pskb_expand_head() function related to calipso_skbuff_setattr() (CVE-2025-71085) and a potential use-after-free (UAF) in the macvlan_forward_source() function (CVE-2026-23001). These vulnerabilities can lead to system instability, unauthorized access, or even remote code execution, posing significant risks to system integrity and security.

How To Fix

Minimum fixed version

4.18.0-553.111.1.rt7.452.el8_10

This is the first release that contains the fix.

sudo dnf update kernel-rt

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Workaround

As a temporary measure, users can limit the use of the affected functionalities until the package is updated. However, the most effective solution is to apply the patch as soon as it is available.

Conclusion

The kernel-rt package has a moderate security vulnerability that requires immediate attention. Users are advised to update to the patched version to ensure system security and stability. Utilizing tools like Vulert can help in monitoring and managing such vulnerabilities effectively.

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