Linux and other open-source software can still be safe and secure because they enable many individuals to actively monitor and review publicly available source code.

Originally written as part of a personal project, Torvalds acknowledges that Linux's growth came from opening it up to a community of users who could each work on different components, including those that were not his strength, such as the user interface. He also admits to being an engineer, rather than a visionary, relating more to Thomas Edison than Nikola Tesla.

Besides the Astrobee robots and computer systems on the ISS, the security and reliability of Linux distros have led to their use by the Federal Aviation Administration, the Pentagon, the Library of Congress, and the New York Stock Exchange. Many of the operating systems found in smart devices, autonomous vehicles, and wearables also run atop the Linux kernel.

In 2005, after enduring several challenges with BitKeeper—the system then used to manage the Linux source code—Linus Torvalds spent about 10 days writing code for Git, a new system to organize and track versions throughout kernel development. Git provides distributed version control for GitHub, which, as of 2023, is the world's largest host of software development projects.

The Linux kernel, which bridges hardware and software, serves as the basis for many fully customizable operating systems, whose components can be modified or removed to optimize performance or reduce bloat on devices with limited resources. This has made these OSes useful for low-power devices like smart thermostats, as well as for powerful supercomputers that require computational efficiency.

Rather than copyright, the free software license is based on the principles of copyleft—users are allowed to use, modify, and distribute software without charge, provided that any derivative works remain free. The license was introduced in 1989 by Richard Stallman, who founded the Free Software Foundation to promote the accessibility of software.

Version 0.01 of the program authored by Linus Torvalds in 1991 spanned approximately 10,000 lines of code and has progressively grown to accommodate the management of an increasing number of hardware and software components. The kernel grows by an estimated 400,000 lines of code every two months.

When Linus Torvalds developed the Linux kernel—the foundational layer of an operating system—developers incorporated it into other readily available components of the GNU Project to create complete systems. Although these OSes have been colloquially referred to as "Linux" for simplicity for decades, the GNU Project has long argued that they should be called "GNU/Linux" to honor the project's contributions.

Amid conflicts over standardizing and controlling various versions of UNIX—an operating system developed at Bell Labs and owned by AT&T—the GNU Project was announced to create a free, open-source OS. Originally designed for Intel's 386 CPU under the name "Freax," Linus Torvalds Linux kernel would be combined with GNU Project software and customized by growing numbers of developers into many OSes, each tailored to specific computing needs.

Because computer viruses, worms, and other malicious software reside within a computer's operating system, which manages computer hardware and software, cybercriminals writing effective malicious code must understand how the OS manages input and output, permissions, memory, etc. Knowledge of credentials and network access also helps create malware that easily spreads.

This has been driven by kernel-level customizations available with Linux-based operating systems that improve computational performance and reduce latency. As of 2025, Linux's desktop market share is 3.7%, but 87.8% of machine learning workloads run on Linux infrastructure. The Linux OS market is expected to grow 105.8% through 2029.

During a drive-by download attack, security flaws in a program or operating system (e.g., Windows) used to access online content are exploited, and malicious code is downloaded—for example, when loading a hacked webpage—onto a user's device without their knowledge. Restricting internet browsing to safe sites and installing security updates helps prevent these attacks.

While Ubuntu and Linux Mint are among the most beginner-friendly general-use operating systems, Arch Linux is a more advanced option, with a dedicated Arch Wiki available for support. Many Linux distros are optimized for specific use cases, such as Kali Linux for security work and Pop!_OS for high-performance gaming and software development.

The nonprofit, founded in 2000 by IBM, HP, Intel, and others as the Open Source Development Labs, was established to build the infrastructure needed to scale with the growing development of Linux. Upon merging with the Free Standards Group in 2007, it rebranded as the Linux Foundation and, as of 2024, provides a "neutral home for code and collaboration" to almost 1,000 projects.

Because this type of malware requires human intervention, such as plugging an infected flash drive into a computer or downloading and running an infected file, the chance of infection can be greatly reduced by being cautious about unfamiliar emails, attachments, and links. Keeping systems up to date with the latest security fixes is also crucial.

The Google-owned OS for mobile devices runs atop a Linux-based kernel that manages core services and manages software communication with hardware. While many Linux distributions can often be installed on these devices, Android uses its own standard libraries, user interface, and other open-source software, which comprise the Android Open Source Project.

Authored 34 years after the software was coded by Linus Torvalds, the plan dictates that if the maintainers of the code's repository are unable to facilitate a transition to Torvalds' successor, an Organizer will chair a meeting with the invitees of the most recently concluded Maintainers Summit, which will consider options for the ongoing management of the repository.

The first viral infections were identified by comparing the computer code of programs and files with a database of known virus codes, a method known as signature detection. The ongoing creation of new malware made databases continuously outdated, leading to the development of systems that detect patterns consistent with known viral activity.

Many of the first researchers and hobbyists who created viruses and worms showed a natural curiosity in experimenting with and designing such software to make a name for themselves and advance the field of computer science. In the future, AI-augmented malware may adapt in real-time or design enhanced cryptojackers, infostealers, and ransomware for cybercriminals.

During a trip to an Australian zoo, Linus Torvalds, the developer of the Linux kernel, was bitten by a penguin, which inspired the animal to be selected as the software's logo. The first design was drafted by Larry Ewing while a student at Texas A&M University, and the Tux name—short for tuxedo—aligned with the animal's appearance.

Once infected software is run, instructions in the malicious code within the program or file can copy the code to various locations, exacerbating the infection and producing additional symptoms, such as slow performance, altered login credentials, changes to device settings, and system crashes.

On their YouTube channel, Malware historian Daniel White has documented what happens when various types of malware—mostly from the 1980s and 90s—run on a computer or Nokia cell phone. The demonstrations were safely conducted within virtual machines—older operating systems run within contained windows of modern software, resembling a picture-in-picture setup.

A suite of cutting-edge hardware and computation-intensive software creates the potential for self-driving cars to be safer, more fuel-efficient, and more accessible to a broader range of drivers. However, automation also introduces potential cybersecurity threats.

A technician bought an old, likely-decommissioned voting machine from 2013 and took it apart to see how a would-be hacker might be able to exploit its vulnerabilities. Get a sense of the needs for secure, up-to-date voting machines with this...

Besides those authored in research labs as proofs of concept for self-replicating software, hobbyists would create malware that played music or displayed text and animations that intentionally revealed the infection as a means of showing off, rather than hiding their spread.

Some of the earliest significant pieces of malware—the Creeper worm and the Elk Cloner virus—displayed silly messages to users without causing major harm. As computer science has advanced, malware has become more easily spread, incorporated social engineering to manipulate users, targeted infrastructure systems, and been used by governments for virtual espionage.

A mix of centralized cloud infrastructure and legacy protocols leaves the internet susceptible to downtime from minor cyberattacks or software bugs, infrastructure damage caused by extreme weather, and human error if a DNS service provider—the internet's phone book—or a backend system, such as Amazon Web Services, were compromised.

On August 1, 1991, he posted a request on what would be the first version of Linux, writing, "I'm doing a (free) operating system (just a hobby, won't be big and professional like gnu) for 386(486) AT clones. [...] I'd like any feedback on things people like/dislike in minix, as my OS resembles it somewhat."

Computer viruses require user interaction to execute a file and spread, whereas worms can self-replicate across systems without human intervention. Ransomware locks systems until a key is provided, spyware tracks and reports user activity to a third party, and trojans disguise various types of malware as legitimate software.

In founding the Academy Software Foundation in 2018, the Linux Foundation spread its open-source philosophy to the cinema by establishing a neutral forum for sharing animation, visual effects, and audio technologies across projects. Its founding members include DreamWorks Animation, Epic Games, Google Cloud, Intel, and Walt Disney Studios.

What is OSINT? How do hackers gather intel about targets? Just how much can they learn about you? Learn more as we dig in to the world of OSINT.

Cybersecurity researcher John Hammond explores the effectiveness of a dark web search engine, leaks from ransomware group data breaches, and a categorized index of dark web links, including some that are alleged to host malware. Many dark web sites are no longer active or host scams to fool unsuspecting visitors.

While each version is assigned a code, such as 6.8.0-rc7, animal codenames provide more memorable, fun identities for each version. Some Linux distributions have also adopted this philosophy and have used alliterative nicknames to convey the distro's characteristics, such as Ubuntu's "Warty Warthog," described as "functional if not pretty."

Browsing the dark web requires onion routing, which prevents visitors from being identified and the locations from which they connect from being traced. This has been useful to activists in environments affected by political oppression or instability. However, those unfamiliar with navigating the space may encounter malware and network attacks from denizen hackers.

In a 2012 interview, Linus Torvalds claimed that the Apple CEO offered him a job in 2000 to exclusively work on Mac OS's Mach kernel. While Linux has not provided the financial benefits that a business venture with Apple may have, Torvalds stated, "I'm very happy with feeling that I've done the right thing."

Computer viruses are often classified by how they spread or which files they infect, with the oldest ones—boot sector viruses—targeting systems that are active when a computer is turned on. Macros—custom codes in office productivity programs authored to automate tasks—spawned their own class of viruses.

A kernel is an intermediary piece of software on a device that manages the connection between software programs—the services and processes they perform to run correctly—and the available hardware resources, such as memory and computing bandwidth, including prioritizing resource allocation and managing access to specific hardware. A monolithic kernel manages all of an operating system's services, whereas a microkernel only handles essential services.

Insecure devices connected to the Internet of Things pose risks to the entire network, which cybercriminals can hijack to compromise infrastructure and private resident data. Poorly secured systems that become inoperable can undermine the promise of smart cities by worsening the quality of life.

Despite encrypting data and relaying it within the Tor network, traffic between the network exit and the final destination is no longer hidden and can be captured. Law enforcement agencies can also attempt to deanonymize users by monitoring and matching data signal patterns entering and leaving the network via a correlation algorithm.

Displaying as LOVE-LETTER-FOR-YOU.TXT on Windows computers, the file appeared to be a love letter, which many users willingly opened. However, the file contained a script that damaged and hid files, caused Internet Explorer to download software to help steal passwords, and copied itself to all Outlook contacts to continue spreading.