The Linux xz utils backdoor exploit, discussed in an interview at the Open Source Summit 2024 on The New Stack Makers with John Kjell, director of open source at TestifySec, highlights critical vulnerabilities in the open-source ecosystem. This exploit involved a maintainer of the Linux xz utils project adding malicious code to a new release, discovered by a Microsoft engineer. This breach demonstrates the high trust placed in maintainers and how this trust can be exploited. Kjell explains that the backdoor allowed remote code execution or unauthorized server access through SSH connections.