Critical Security Update for Real Time Linux Kernel: kernel-rt Vulnerability (CVE-2026-53006)
Summary
ALSA-2026:47010: Important: kernel-rt security update. Affects kernel-rt versions < 4.18.0-553.148.1.rt7.489.el8_10. Fixed in 4.18.0-553.148.1.rt7.489.el8_10. How to fix ↓
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Background
The kernel-rt package provides a Real Time Linux Kernel designed for systems requiring high determinism. It is essential for applications where timing and responsiveness are critical, such as in industrial automation and real-time data processing. This package is part of the AlmaLinux ecosystem, which aims to provide a stable and secure operating system for enterprise environments.
Vulnerability Detail
The vulnerability identified as CVE-2026-53006 is a use-after-free (UAF) issue in the icmpv6_rcv() function of the kernel. This flaw can potentially allow an attacker to exploit the kernel's handling of IPv6 packets, leading to arbitrary code execution or system crashes. The vulnerability arises from improper memory management, which can be exploited under certain conditions, posing significant risks to system integrity and security.
How To Fix
Minimum fixed version
4.18.0-553.148.1.rt7.489.el8_10
This is the first release that contains the fix.
sudo dnf update kernel-rtTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, 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 line to the '/etc/sysctl.conf' file: 'net.ipv6.conf.all.disable_ipv6 = 1'. After making this change, run 'sudo sysctl -p' to apply the settings.
Conclusion
The kernel-rt vulnerability (CVE-2026-53006) poses significant risks to systems relying on the Real Time Linux Kernel. It is crucial to apply the recommended updates to ensure system security and integrity. Users should also consider using tools like Vulert to monitor for vulnerabilities in their software.
See every vulnerability recorded for kernel-rt →
FAQ
CVE-2026-53006 is a security vulnerability in the kernel-rt package that can lead to arbitrary code execution due to a use-after-free issue in the icmpv6_rcv() function.
You can use Vulert, which monitors open-source vulnerabilities in your software. By uploading your manifest file, you can check for vulnerabilities without needing to install additional software.
Failing to address this vulnerability may expose your system to potential attacks, leading to unauthorized access, data breaches, or system crashes.
Yes, temporarily disabling IPv6 can reduce the risk of exploitation until the patch is applied.
For detailed information, refer to the CVE page associated with CVE-2026-53006, which provides insights into the vulnerability's impact and mitigation strategies.
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