Wow. I tried it on an old testing VM of Ubuntu 24.04 that had not been touched for a few months. Instant root with the bonus that any user that runs "su" gets root too. I updated the VM thinking it would be fixed afterward. Nope.

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akdev1l an hour ago | parent [-]

You’d have to reinstall the su binary itself I guess

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cyberpunk an hour ago | parent [-]

It just changes the page cache for the su binary, a reboot will revert it.

	▲	majorchord 26 minutes ago \| parent [-]
		No need to reboot: sync && echo 3 >/proc/sys/vm/drop_caches