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Date: Tue, 24 Nov 2020 01:41:13 +1100
From: Andrew Donnellan <>
        linuxppc-dev <>
Subject: Re: Linux kernel: powerpc: RTAS calls can be used to compromise
 kernel integrity

On 9/10/20 12:20 pm, Andrew Donnellan wrote:
> The Linux kernel for powerpc has an issue with the Run-Time Abstraction 
> Services (RTAS) interface, allowing root (or CAP_SYS_ADMIN users) in a 
> VM to overwrite some parts of memory, including kernel memory.
> This issue impacts guests running on top of PowerVM or KVM hypervisors 
> (pseries platform), and does *not* impact bare-metal machines (powernv 
> platform).
CVE-2020-27777 has been assigned.

Andrew Donnellan              OzLabs, ADL Canberra             IBM Australia Limited

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