Linux kernel Archives

Winsage

July 2, 2026

Microsoft’s new Azure Linux 4.0 is here, and it could replace Windows Server in the enterprise

Microsoft has released Azure Linux 4.0, transitioning it from an internal tool to a server operating system that users can install on their own servers and virtual machines. Azure Linux 4.0 is built on Fedora Linux, allowing the use of RPMs and ensuring compatibility with Azure's cloud platform. The beta version features a hardened Linux kernel 6.18, optimized for performance on Hyper-V and Azure virtual machines, and incorporates SELinux-based security measures without a graphical user interface. In the Azure Marketplace, it is marketed as a "Microsoft-built Linux distribution for Azure," with formal support available for deployments on Azure but not for standalone hardware. The Azure Linux GitHub repository provides transparency into the distribution, encouraging community engagement while Microsoft retains control over the base image's contents. Azure Linux is positioned as a free, Azure-optimized server operating system for hybrid environments, potentially signaling a shift away from Windows Server.

Winsage

June 28, 2026

Microsoft denies WSL 3 exists, reveals Windows 11’s WSL Containers ship next week

Microsoft has clarified that there is no WSL 3 in development, as stated by Craig Loewen, the Product Manager for the Windows Subsystem for Linux (WSL). The confusion arose from articles discussing a new feature called WSL Containers, which will be launched soon. WSL allows users to run Linux environments on Windows without dual-booting, while WSL Containers enable the creation and management of Linux containers directly within Windows, eliminating the need for third-party tools like Docker Desktop. WSL 1, introduced in 2016, served as a translation layer for Linux system calls, and WSL 2, launched in 2019, included a full Linux kernel in a lightweight virtual machine. WSL Containers is an enhancement to WSL, allowing developers to build, run, and deploy containers directly from Windows using the wslc.exe command. This feature is part of Microsoft's strategy to make Windows a more accessible platform for running Linux workloads, helping to retain developers who might consider switching to other operating systems.

Winsage

June 16, 2026

A Brief History Of Unix Commands On Windows: CoreUtils (Again)

The interaction between Unix/Linux and Windows has historically been marked by significant differences in their architectures and philosophies. Unix uses a fork() function for process management, while Windows employs CreateProcess(), complicating the implementation of Unix-like tools on Windows. Early solutions to bridge this gap included the MKS Toolkit, which provided Unix-like commands for Windows, and UWIN from AT&T Bell Labs, which aimed to create a Unix interface layer on Windows. Cygwin offered a compatibility DLL to run Unix software on Windows, but required rebuilding from source. Microsoft's initiatives included POSIX, Interix, and later Services for UNIX. The introduction of the Windows Subsystem for Linux (WSL) allowed users to run a Linux userland directly on Windows, with WSL 2 incorporating a real Linux kernel. Recently, Microsoft released Coreutils for Windows, providing native builds of Unix-style tools to enhance cross-platform consistency.

Winsage

June 1, 2026

Linux desktops finally learned restraint, and that’s the upgrade Windows still hasn’t made

The Linux kernel maintainers have decided to phase out support for outdated hardware, including processors over three decades old, to keep the system agile and relevant. The Ubuntu team plans to introduce AI tools with a focus on open-source and user experience, allowing users to opt-out. Linux distributions typically adopt a respectful approach to monetization, often allowing users to use the system without financial obligation, contrasting with aggressive marketing tactics from companies like Microsoft. Linux's measured approach to innovation fosters a sense of community and reliability among users.

Winsage

May 15, 2026

For May, Patch Tuesday means 139 updates

Microsoft has released an extensive update for Azure Linux 3.0 and CBL Mariner 2.0, addressing 191 open-source Common Vulnerabilities and Exposures (CVEs) across various technologies, including the Linux kernel, Go runtime, Apache httpd, PHP, CoreDNS, Valkey, Ruby, GnuTLS, Apache Thrift, Node.js, Rust, Java implementations, Vim, Postfix, Expat, Nmap, Prometheus, KEDA, and PgBouncer. Additionally, Microsoft has fixed a critical vulnerability (CVE-2026-41103) in its Single Sign-On (SSO) Plugin for Jira and Confluence, which allows an attacker to forge a Microsoft Entra ID identity through a manipulated SAML response; however, patching this vulnerability is the responsibility of the users of Atlassian's platforms.

Tech Optimizer

May 4, 2026

Wiz ZeroDay.Cloud Event Reveals 20-Year-Old PostgreSQL Vulnerabilities

Cybersecurity researchers at Wiz’s ZeroDay.Cloud event in London exploited two significant vulnerabilities in PostgreSQL, tracked as CVE-2026-2005 and CVE-2026-2006, which were disclosed on May 4, 2026. The vulnerabilities were found in the pgcrypto extension, affecting public-key decryption and symmetric decryption functions. CVE-2026-2005 allows privilege escalation via a buffer overflow during public-key decryption, while CVE-2026-2006 enables attackers to corrupt memory through inadequate checks in symmetric decryption. PostgreSQL has released patches for these vulnerabilities across versions 14.21 to 18.2, and MariaDB addressed a related issue in versions 11.4.10 and 11.8.6. Database administrators are advised to apply updates and audit logs for suspicious activity.

Winsage

April 25, 2026

Linux and Windows 95 running side by side? This dev made it happen.

Open-source developer "Hailey" has introduced the Windows 9x Subsystem for Linux (WSL9X), which allows users to run both Windows and Linux applications simultaneously on classic versions of Windows, including Windows 95, 98, and Me. WSL9X operates by running a modern Linux kernel (6.19) alongside the Windows 9x kernel, enabling features such as paging, memory protection, and pre-emptive scheduling. It is neither emulation nor virtualization and does not require hardware virtualization. WSL9X is available for download, but users must build it from the source provided by Hailey. It allows access to a genuine Linux terminal alongside classic Windows applications, enabling various tasks without compromising system stability.

Winsage

April 24, 2026

WSL9x: Add An Entire Windows 9x Subsystem To Your Linux

The Linux Subsystem for Windows 9x, led by Hailey Somerville, allows Linux to run within the Windows 9x framework by modifying the Linux kernel to interface with Windows 9x kernel APIs. Users need to create a specially modified Linux kernel (version 6.19) and a disk image with Windows 9x installed. The subsystem can be initiated with the wsl command, enabling both kernels to operate together. This initiative is reminiscent of Cooperative Linux and parallels the Windows Subsystem for Linux (WSL2) on Windows 10 and later. Contributions from the community have been vital to the project's development.

Winsage

April 23, 2026

Get Linux on your ancient 486 Windows 95 desktop using WSL9x — very old Windows PCs can cooperatively run very modern Linux kernels

A computer enthusiast has developed a tool called WSL9x, which allows users to run contemporary Linux kernels on early versions of Windows (from Windows 95 onward) and on machines with 486 CPUs. WSL9x enables the simultaneous operation of Windows and Linux applications without relying on hardware virtualization. The architecture includes a client program, wsl.com, which manages a DOS window for the console driver. Meanwhile, the Linux community is phasing out support for the Intel 486 CPU, with developers removing related support options in the Linux kernel, marking the end of support for this processor.

Winsage

April 22, 2026

You can now run WSL on Windows 95, in case you’re crazy, too

Hailey has developed the Windows 9x Subsystem for Linux (WSL9x), which allows the 6.19 Linux kernel to run on Windows 9x systems without a graphical user interface, relying instead on a terminal experience. WSL9x consists of three main components: a modified Linux kernel that interacts with Windows 9x APIs, a virtual device (VxD) driver that initializes WSL9x and manages userspace events, and a simple 16-bit DOS client for passing commands to the Linux kernel. The system handles syscalls through a general protection fault handler due to limitations in the Win9x architecture. However, this setup poses security risks as both the Linux kernel and Windows kernel operate with the same CPU privileges, meaning instability could occur if either crashes. Comprehensive instructions for installation are available on Hailey's Codeberg page.