Moderate Kernel Security Update: Addressing Use-After-Free Vulnerability in AlmaLinux Kernel Packages
Summary
ALSA-2026:4723: Moderate: kernel security update. Affects kernel versions < 6.12.0-124.45.1.el10_1. Fixed in 6.12.0-124.45.1.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. AlmaLinux, a community-driven enterprise Linux distribution, relies on the kernel for stability and performance. The recent vulnerability identified as CVE-2026-23010 affects the kernel packages, specifically related to IPv6 address deletion, which could lead to potential denial of service attacks.
Vulnerability Detail
The vulnerability arises from a use-after-free condition in the kernel's handling of IPv6 address deletion. This flaw allows an attacker to exploit the memory management of the kernel, potentially leading to a denial of service. When the kernel attempts to free memory that is still in use, it can cause system instability or crashes, making the system vulnerable to attacks that could disrupt services or compromise system integrity.
How To Fix
Minimum fixed version
6.12.0-124.45.1.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, users can limit the exposure of their systems by disabling IPv6 if it is not required for their applications. This can be done by adding the following lines to the '/etc/sysctl.conf' file: 'net.ipv6.conf.all.disable_ipv6 = 1' and 'net.ipv6.conf.default.disable_ipv6 = 1'. After making these changes, run 'sudo sysctl -p' to apply the new settings.
Conclusion
The vulnerability CVE-2026-23010 poses a significant risk to systems running affected versions of the AlmaLinux kernel. It is crucial to update to the patched version to ensure system stability and security. Users should also consider temporary workarounds if immediate updates are not feasible.
See every vulnerability recorded for kernel →
FAQ
CVE-2026-23010 is a security vulnerability in the Linux kernel that involves a use-after-free condition during IPv6 address deletion, potentially leading to denial of service.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Failing to address this vulnerability may expose your system to denial of service attacks, which can disrupt services and compromise system stability.
Yes, Vulert provides a solution that monitors and alerts in real-time for open-source vulnerabilities using just a manifest file like package-lock.json.
If immediate updates are not possible, consider disabling IPv6 as a temporary workaround to mitigate the risk until you can apply the patch.
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