Linux doesn’t need antivirus the way Windows does, but not for the reason most people think

Published Oct 13, 2026, 8:00 PM EDT Anmol has been interested in tech for close to two decades now and has been covering all things tech for more than a decade. He started his journey with a blog post, when Google Blogger used to be cool and has covered everything from Windows Phone to Windows 11. Anmol has written for MSPoweruser and Neowin in the past, and is always keen to get his hands on the latest gadgets. When not doomscrolling, you would find him playing video games, reading or catching up on football. Linux has forever been considered above Windows when it comes to security. Part of the reason for that, and what people usually assume, is that Linux doesn't have a meaningful market share for attackers to target with sophisticated malware or attacks. While that holds true when compared to Windows's market share, it definitely is not the full picture. Linux also has an advanced permission management system that usually prevents files from being accessed or executed, which provides additional security. I tested this by setting up WSL and an Ubuntu installation, then letting it scan my data, including a file infected with make-believe malware, to see how it responded. Attackers do target Linux Let's look at what happened earlier this year when hackers decided that Linux had enough users to launch an attack. In June 2026, Arch User Repository (AUR) was compromised by hackers who injected malware into over 400 packages. The attackers adopted abandoned packages and edited their build instructions, so installing them also pulled in an npm package called atomic-lockfile to deliver rootkit-like malware. Sonatype later noted that an estimated roughly 1,500 packages across AUR were impacted and were modified to steal credentials. Since then, AI has made it easier for people with limited coding knowledge to build and execute targeted attacks aimed at stealing or harvestingcredentials. Linux’s defaults make attackers work harder A downloaded script does nothing until you allow it Linux permission setup does not allow files to be executable by default without explicit user permission. This ensures that malware that was downloaded or transferred to a Linux system is not executed automatically. I tested this by asking my Ubuntu CLI to run a simple one-line script, which it denied because the system didn't have enough permissions to run it. System folders work in a similar way, and running a command to create a new file simply failed. One caveat, of course, was that my account on Ubuntu is set up in the sudo group, so the system safety was more or less fully in my hands. Good terminal habits can be a life-saver when it comes to Linux, especially if you are logged in as admin or using sudo. One of the reasons for the AUR attack was that users probably ran packages without reviewing changes, allowing malicious code to run on the system. Antivirus flags only what it recognizes ClamAV is good at known files, not at trust decisions I installed ClamAV on my copy of Ubuntu and downloaded its database of about 3.6 million entries. Once done, I created an EICAR test file on my system. For those unaware, an EICAR test file is a harmless 68-byte to 128-byte dummy malware file created by the European Institute for Computer Antivirus Research (EICAR) and the Computer Antivirus Research Organization to test antivirus. ClamAV was quick to flag the file as infected when I ran the virus scan and reported EICAR-signature FOUND straight away. However, this is half the story. Antivirus like ClamAV is great at recognizing known threats and malware but falls short with new malware, or malware that isn't obvious or is embedded in the executable. That's where things differ for Linux: having antivirus, while good practice, doesn't make you fully secure against threats. Running a scanner anyway is reasonable It helps ensure your system does not have files that can cause harm As mentioned above, antivirus is only half the story on Linux, and Linux permissions limit the damage if you accidentally download malware. This is why people often don't need antivirus on Linux as long as they follow good habits, like not giving every file or folder full permissions and ensuring packages come from trusted sources. Another tip that works wonders is to always check what changed when a package was recently updated. Also, ensure the package is coming from a trusted source and is not modified by a middleman. The obvious counterpoint is that something like ClamAV has no real downside while providing an extra layer of protection, helping you scan and vet files downloaded online or in email attachments. Linux’s real protection is a habit, not a product Keep ClamAV for scanning files and keep your trust decisions for yourself Linux is generally safer than Windows because of its permission system, how it handles packages, and its rapid patching of bugs and vulnerabilities, plus a smaller user base than Windows or macOS, which makes it less lucrative for attackers looking to do maximum damage. Overall, this makes a case for Linux not needing an antivirus in the traditional sense, like one would for Windows or a Mac. However, tools like ClamAV can provide an extra layer of security against known threats. The threat landscape is changing, and it is changing rapidly thanks to AI tools that can comb through data and lines of code to find vulnerabilities that can be targeted. So the notion that Linux doesn't require any security is outdated and, frankly, dangerous. However, the good news is that if you follow good security hygiene, keep your system updated, and exercise caution when downloading or running unverified scripts, you should be in a good place.