Critical Use-After-Free Vulnerability in Kernel Package: Important Security Update Required
Summary
ALSA-2026:44270: Important: kernel security update. Affects kernel versions < 6.12.0-211.38.1.el10_2. Fixed in 6.12.0-211.38.1.el10_2. How to fix ↓
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Background
The kernel package is a fundamental component of the Linux operating system, responsible for managing system resources and hardware communication. It provides essential services for all other software applications and is crucial for system stability and performance. This vulnerability specifically affects the kernel in AlmaLinux 10, which is widely used in server environments and enterprise applications.
Vulnerability Detail
The vulnerability identified as CVE-2026-46323 is a Use-After-Free issue in the net/gro subsystem of the Linux kernel. This flaw arises from improper handling of zerocopy socket buffers (skbs), which can lead to memory corruption. An attacker could exploit this vulnerability to execute arbitrary code, potentially compromising the entire system. The ramifications of such an exploit could include unauthorized access, data leakage, or complete system takeover.
How To Fix
Minimum fixed version
6.12.0-211.38.1.el10_2
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 measure, users can limit access to the affected services or applications that utilize the kernel until the patch is applied. Additionally, consider using security mechanisms such as SELinux to mitigate potential exploitation.
Conclusion
The CVE-2026-46323 vulnerability poses a significant risk to systems running the affected kernel version in AlmaLinux 10. Immediate action is required to update to the patched version to safeguard against potential exploits. Regular system updates and monitoring for vulnerabilities are essential practices for maintaining system security.
See every vulnerability recorded for kernel →
FAQ
CVE-2026-46323 is a security vulnerability in the Linux kernel that allows for a Use-After-Free condition, potentially leading to memory corruption and system compromise.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities. By uploading your manifest file, such as package-lock.json, you can check if your application is affected.
Exploiting this vulnerability could allow attackers to execute arbitrary code, leading to unauthorized access, data breaches, or complete control over the affected system.
Yes, you can limit access to affected services and use security features like SELinux to help protect your system until the patch is applied.
It is recommended to regularly check for updates and apply them promptly, especially when security vulnerabilities are disclosed.
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