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> many multiuser Linux systems nowadays

not relevant IMHO

we don't live anymore in a time where you can trust that local apps do not misbehave, and in such a context LPE is pretty bad even in a single user system

just thing about all the supply chain problems of recent times

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I would say that in a single-user system LPE isn't even needed. The moment you run malicious code all bets are off. No need to compromise the system when all your data is under "enemy" control.

Technically, running malicious code doesn't necessarily give control over all your data in the device. But common Linux is still lacking in sandboxing practicality, so it might as well be that way.

You might not have root on an organizational "managed" system.

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