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Kaspersky analysis of the backdoor in XZ
(web.archive.org)
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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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That's not a source. By that metric every American AV has an NSA backdoor. And, ok, both of these are probably true tbh. But Kaspersky publishes extremely good security research and analysis which is just technical and totally possible to verify independently, so there's no reason to avoid those, even if you don't want to use their software.
I don't use any of that software because it is a proprietary black box
That's a different topic, you're moving the goalposts :P