# Re: Linux kernel: powerpc: RTAS calls can be used to compromise kernel integrity

- From: Andrew Donnellan \<hidden\>
- Date: 2020-11-23 14:44:34 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2020/11/9519582
- Thread: https://ratatoskr.run/linuxppc-dev/2020/10/9519056/t.md

```text
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
ajd@linux.ibm.com             IBM Australia Limited
```