Critical Kernel Vulnerability in Rocky Linux: Denial of Service and Privilege Escalation Risks
Summary
RLSA-2026:13566: Important: kernel security update. Affects kernel versions < 0:6.12.0-124.55.1.el10_1. Fixed in 0:6.12.0-124.55.1.el10_1. How to fix ↓
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Background
The kernel is the core component of any Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. In Rocky Linux 10, the kernel package is crucial for system stability and performance. However, vulnerabilities in the kernel can lead to severe security risks, including denial of service and privilege escalation, which can compromise the integrity of the entire operating system.
Vulnerability Detail
This vulnerability arises from multiple issues within the Linux kernel, including a use-after-free condition in traffic control and the bonding driver, as well as a heap overflow in the NFSv4.0 LOCK replay cache. These vulnerabilities can be exploited to cause denial of service, allowing attackers to crash the system or escalate their privileges, potentially gaining unauthorized access to sensitive data and system functions.
How To Fix
Minimum fixed version
0:6.12.0-124.55.1.el10_1
This is the first release that contains the fix.
sudo dnf update kernelTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, consider disabling the affected features in the kernel until the update can be applied. However, this may not be feasible for all users and should be approached with caution.
Conclusion
In summary, the kernel vulnerabilities in Rocky Linux 10 pose significant risks, including denial of service and privilege escalation. It is crucial to update the kernel package to the latest version to protect your system from potential exploitation. Utilize tools like Vulert to monitor for vulnerabilities and ensure your software remains secure.
See every vulnerability recorded for kernel →
FAQ
A use-after-free vulnerability occurs when a program continues to use a memory reference after it has been freed, potentially allowing an attacker to manipulate the memory and execute arbitrary code.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. By simply uploading your manifest file, you can check for vulnerabilities without needing to install any software.
The potential impacts include denial of service, where the system can crash or become unresponsive, and privilege escalation, where an attacker gains unauthorized access to system resources.
While the best course of action is to update the kernel, you may consider disabling certain features or limiting access to the affected services as a temporary measure.
The CVSS score for this vulnerability is 7.8, indicating a high level of severity and the need for prompt action.
References
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