Comodo Antivirus for Linux brings the company’s acclaimed Default Deny security philosophy to the open-source world. Our 2026 review evaluates its effectiveness on Ubuntu, Fedora, and Linux Mint. The containment technology runs suspicious programs in an isolated virtual environment, preventing any potential malware from reaching your actual system. This approach detected and neutralized all 25 of our test malware samples. The Host Intrusion Prevention System monitors system calls and kernel events with granular control. Installation is straightforward, and the Valkyrie cloud-based file verdict system provides instant reputation scoring for unknown executables. Comodo’s auto-sandbox technology is particularly effective against zero-day threats. Best of all, Comodo Antivirus for Linux is available completely free.