Timing Flaw in systemd Cleanup Enables Root Privilege Escalation (cybersecurity88.com)

submitted 5 days ago by ChrisG@lemmy.world to c/linux@lemmy.ml

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Yet another critical vulnerability in systemd, this time involving snapd. Ubuntu folk are affected.

"A serious security issue has been discovered in Ubuntu, and it is gaining attention in the cybersecurity community. The vulnerability is identified as CVE-2026-3888 and mainly affects Ubuntu Desktop systems from version 24.04 onwards. This flaw is dangerous because it allows an attacker with limited access to gain full root privileges. Root access means complete control over the entire system."

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[-] ChrisG@lemmy.world 0 points 2 days ago* (last edited 2 days ago)

Exactly. systemd has a glaring security hole that had to be kludged. As the OP I posted the article to warn non technical users of the danger but systemd defenders league are predictably blind to any possible flaw in their golden calf and cannot resist the temptation to rush to battle. yawn

[-] FauxLiving@lemmy.world 2 points 2 days ago* (last edited 2 days ago)

What is the security hole in systemd?

You haven't answered this.

systemd-tmpfiles exists to delete inactive files in /tmp. That's not a security flaw, that's system maintenance. It's the documented purpose of systemd-tmpfiles and it performs exactly was documented.

The security hole is in snap-confine which does not verify that its own directory is owned by root before mounting it AS ROOT. That's the security hole.

So, again, what is the security hole in systemd?

If you don't have an answer then just say so. Resorting to name calling and trying to frame this as if I'm the irrational one is absurd.

this post was submitted on 01 Apr 2026

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