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Date: Mon, 15 Jun 2020 17:03:12 -0600
From: "Jason A. Donenfeld" <>
To: oss-security <>
Subject: Re: lockdown bypass on mainline 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. Note that this would be for a *different* CVE than
the one I requested for the Ubuntu vulnerability a minute ago. This
vulnerability here affects a different set of kernels and uses a
different vector.


On Mon, Jun 15, 2020 at 4:26 AM Jason A. Donenfeld <> wrote:
> Hi everyone,
> Yesterday, I found a lockdown bypass in Ubuntu 18.04's kernel using
> ACPI table tricks via the efi ssdt variable [1]. Today I found another
> one that's a bit easier to exploit and appears to be unpatched on
> mainline, using acpi_configfs to inject an ACPI table. The tricks are
> basically the same as the first one, but this one appears to be
> unpatched, at least on my test machine. Explanation is in the header
> of the PoC:
> I need to get some sleep, but if nobody posts a patch in the
> meanwhile, I'll try to post a fix tomorrow.
> Jason
> [1]

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