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How the xz backdoor highlights a major flaw in Nix
(shadeyg56.vercel.app)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Anyway the xz backdoor was enabled only in rpm and deb packages.
AFAIK it was enabled in anything that used the official source tarball. The exploit binaries were added during the tarball build process.
Nope. There were checks of build environment.
Then why did all distros issue a fix for the package?
Because nobody can be sure there are no other backdoors. And, I guess, they wanted to stop distribution of affected source code.