Bitflip comments on 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.

[+] Bitflip@lemmy.ml 72 points 6 months ago (8 children)

[deleted]

parent

[–] nyan@sh.itjust.works 32 points 6 months ago (5 children)

Exactly. It's Yet Another Privilege Escalation Vulnerability. Unless you're dealing with a multiuser machine, the attacker first needs to use some other vuln to get into an unprivileged account. Without that additional vulnerability, this exploit is useless.

permalink

fedilink

source

parent

hideshow 5 child comments

[–] solrize@lemmy.ml 20 points 6 months ago (1 child)

some other vuln

You mean like inveigling it into a pypi or npm or whatever package? Checks out.

permalink

fedilink

source

parent

hideshow 1 child comment

[–] Aatube@piefed.social 15 points 6 months ago

That's privilege escalation for you. 7.8 is pretty high.

permalink

fedilink

source

parent

[–] tomalley8342@lemmy.world 5 points 6 months ago* (2 children)

Yet another? Are there really so many LPEVs in linux?

permalink

fedilink

source

parent

hideshow 2 child comments

[–] olosta@lemmy.world 8 points 6 months ago

I manage multi user systems and try to be on top of this and no, privilege escalation with a working public exploit are very rare. There's quite a lot of CVEs with potential privilege excalation, but most of the time there is no real world exploit. And a large part of those are related to user namespaces in one way or another.

This one is truly scary, at least the immediate mitigation is pretty straightforward.

permalink

fedilink

source

parent

[–] nyan@sh.itjust.works 5 points 6 months ago

Well, it often feels like every "Linux security issue" flagged in the tech press is a privilege escalation, but I admit that I haven't sat down and done the math.

permalink

fedilink

source

parent