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Date: Fri, 22 Jan 2021 13:42:27 +0530 (IST)
From: P J P <>
To: oss security list <>
cc: Alex Xu <>, Stefan Hajnoczi <>
Subject: CVE-2020-35517 QEMU: virtiofsd: potential privileged host device
 access from guest


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

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