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Date: Fri, 22 Jan 2021 05:37:22 -0500
From: Daniel Walsh <>
Subject: Re: CVE-2020-35517 QEMU: virtiofsd: potential
 privileged host device access from guest

On 1/22/21 03:12, P J P wrote:
>   Hello,
> A potential host privilege escalation issue was found in the virtio-fs 
> shared file system daemon (virtiofsd) of the QEMU. Virtio-fs daemon 
> shares host directory tree with a guest VM. The said privilege 
> escalation scenario may occur if a privileged guest user was to create 
> device special file in the shared directory and use it to r/w access 
> host devices. A privileged guest user may use this flaw to arbitrarily 
> access (r/w) host files resulting in DoS scenario or may potentially 
> escalate privileges on the host.
> Upstream patch:
> ---------------
>   ->
> * This issue was reported by Alex Xu (CC'd).
> * 'CVE-2020-35517' assigned by Red Hat Inc.
> Thank you.
> -- 
> Prasad J Pandit / Red Hat Product Security Team
> 8685 545E B54C 486B C6EB 271E E285 8B5A F050 DE8D
Did SELinux block this flaw?  Seems virtiofsd should be running without 
CAP_MKNOD by default.

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