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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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Copy Fail (CVE-2026-31431) is a trivially exploitable logic bug in Linux, reachable on all major distros released in the last 9 years. A small, portable python script gets root on all platforms. (copy.fail)

submitted 1 day ago by rabber@lemmy.ca to c/linux@lemmy.ml

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[–] sun_is_ra@sh.itjust.works 41 points 1 day ago* (last edited 1 day ago)

I can at least tell you what it does because I tested it:

It override your /usr/bin/su so that it now let you run as root with no password.

My guess is that the payload is an su command that was modified to run without requiring password but it's also possible - though unlikely - that it just patch your existing su.

either way if you will run the script, you need to backup your existing su command first.

Correction: The script doesn't permanently modify the su file instead it modifies a cached copy of the file in memory. restarting your device or doing echo 3 > /proc/sys/vm/drop_caches to flush the cache restore the su file to its original state