Critical Kernel Security Update for AlmaLinux: Addressing Vulnerabilities in bpftool and Kernel Packages
Summary
ALSA-2026:A008: Important: kernel security update. Affects bpftool versions < 4.18.0-553.124.4.el8_10. Fixed in 4.18.0-553.124.4.el8_10. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Habilume
Habit tracker with a companion that grows with you
Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent.
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 Linux kernel for its functionality. The kernel packages include essential tools and libraries, such as bpftool, which is used for managing Berkeley Packet Filter (BPF) programs. This update addresses critical security vulnerabilities that could potentially compromise system integrity and security.
Vulnerability Detail
The vulnerabilities identified in this update are rooted in the kernel's handling of network packets and process tracing. CVE-2026-46300 highlights an issue where the shared-frag marker is not properly propagated through frag-transfer helpers, which could lead to unexpected behavior or exploitation. CVE-2026-46333 indicates that the ptrace system call does not require the CAP_SYS_PTRACE capability when a task has no memory management structure, potentially allowing unauthorized access to process memory. These vulnerabilities can lead to privilege escalation and unauthorized data access, posing significant risks to system security.
How To Fix
Minimum fixed version
4.18.0-553.124.4.el8_10
This is the first release that contains the fix.
sudo dnf update bpftoolTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, users can restrict access to the ptrace system call by modifying system permissions or using security modules like SELinux to enforce stricter access controls. However, this is not a permanent solution and should be followed by applying the necessary updates.
Conclusion
In summary, the kernel security update for AlmaLinux addresses critical vulnerabilities that could compromise system security. Users are strongly encouraged to update their packages to the latest version to mitigate these risks. Utilizing tools like Vulert can further enhance security by providing real-time monitoring for open-source vulnerabilities.
See every vulnerability recorded for bpftool →
FAQ
CVE-2026-46300 is a vulnerability in the Linux kernel related to improper handling of the shared-frag marker in network packets, which could lead to exploitation.
CVE-2026-46333 is a vulnerability that allows unauthorized access to process memory due to insufficient checks on the ptrace system call.
You can use Vulert, a tool that monitors open-source vulnerabilities, to check if your application is affected. Visit Vulert Scanner to use the Vulert playground without signup.
If immediate updates are not possible, consider implementing temporary workarounds such as restricting ptrace access or using SELinux for enhanced security.
It is advisable to regularly check for vulnerabilities, especially after major updates or when new vulnerabilities are disclosed. Tools like Vulert can help automate this process.
Related vulnerabilities
Recent vulnerabilities recorded for bpftool.
Habilume
Habit tracker with a companion that grows with you
Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent.
