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Date: Tue, 24 May 2022 20:18:02 +0000
From: John Haxby <>
To: "" <>
Subject: Re: CVE-2022-21499: trivial lockdown break

> On 24 May 2022, at 18:10, John Haxby <> wrote:
> Hello All,
> CVE-2022-21499: trivial lockdown break
> We recently discovered that it is trivial to break lockdown (and secureboot) using the kernel debugger: you can use the debugger to write zero into a location of your choice ...
> I originally posted this with a preliminary patch on linux-distros.   Since then we have developed a better patch that takes into account the differences between integrity and confidentiality modes.
> The updated patch will be available in the Linux mainline kernel at almost the same time as I'm sending this email.  I'll reply with the commit ID as soon as I have it.   If anyone wants the simpler patch that I posted to linux-bistros, please let me know, but I would encourage you to take the full patch.
> jch

The commit that fixes this is eadb2f47a3ce ("lockdown: also lock down previous kgdb use") [1]



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