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Date: Mon, 15 Jun 2020 17:02:05 -0600
From: "Jason A. Donenfeld" <>
To: oss-security <>,
Subject: Re: lockdown bypass on ubuntu 18.04's 4.15 kernel for loading
 unsigned modules

Hi Mitre,

People are requesting a CVE to track this and are poking me to poke
you to assign one.


On Sun, Jun 14, 2020 at 12:30 AM Jason A. Donenfeld <> wrote:
> Hey folks,
> I noticed that Ubuntu 18.04's 4.15 kernels forgot to protect
> efivar_ssdt with lockdown, making that a vector for disabling lockdown
> on an efi secure boot machine. I wrote a little PoC exploit to
> demonstrate these types of ACPI shenanigans:
> The comment on the top has description of exploit strategy and such. I
> haven't yet looked into other kernels and distros that might be
> affected, though afaict, Canonical's kernel seems to deviate a lot
> from upstream.
> Jason

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