Summary: The latest versions of the “xz” tools and libraries contain malicious code that appears to be intended to allow unauthorized access. Specifically, this code is present in versions 5.6.0 and 5.6.1 of the libraries. Fedora Linux 40 users may have received version 5.6.0, depending on the timing of system updates. Fedora Rawhide users may have received version 5.6.0 or 5.6.1.
It says F39 users are not affected. Are you running Rawhide/F40 Beta? p
Running Arch, so not really exposed, but still had a compromised version installed.