Critical Kernel Vulnerability in AlmaLinux 10: In-Place Decrypt Issue
Summary
ALSA-2026:A006: Important: kernel security update. Affects kernel versions < 6.12.0-124.55.3.el10_1. Fixed in 6.12.0-124.55.3.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. AlmaLinux 10, a community-driven enterprise-grade Linux distribution, relies on a robust kernel to ensure system stability and security. However, vulnerabilities in the kernel can lead to severe security risks, affecting the overall integrity of the operating system.
Vulnerability Detail
The vulnerability identified as CVE-2026-43284 pertains to an issue in the kernel's xfrm (IPsec transformation) subsystem. Specifically, it involves an in-place decryption flaw on shared skb (socket buffer) fragments. This vulnerability can potentially allow an attacker to exploit the decryption process, leading to unauthorized access to sensitive data or system resources. The ramifications of this vulnerability are significant, as it could compromise the confidentiality and integrity of data transmitted over the network.
How To Fix
Minimum fixed version
6.12.0-124.55.3.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, users may consider disabling IPsec transformations until the kernel is updated. However, this may impact network security and should only be done if absolutely necessary.
Conclusion
The CVE-2026-43284 vulnerability poses a critical risk to AlmaLinux 10 systems by allowing potential unauthorized access through an in-place decryption flaw. It is crucial for users to update their kernel to the patched version to mitigate this risk. Regular monitoring and vulnerability management are essential for maintaining system security.
See every vulnerability recorded for kernel →
FAQ
CVE-2026-43284 is a vulnerability in the Linux kernel's xfrm subsystem that allows for in-place decryption on shared skb fragments, potentially leading to unauthorized data access.
You can use tools like Vulert, which monitors open-source vulnerabilities in your software. By uploading your manifest file, you can check for vulnerabilities without any installation.
Exploiting this vulnerability could allow attackers to gain unauthorized access to sensitive data, compromising the security of the system and potentially leading to data breaches.
Yes, a patch is available in the form of an updated kernel package. Users should update to version 6.12.0-124.55.3.el10_1 or later.
If an immediate update is not possible, consider disabling IPsec transformations as a temporary workaround, but be aware of the potential security risks.
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