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Date: Tue, 20 Nov 2018 16:51:28 +0530 (IST)
From: P J P <>
To: oss security list <>
cc: Greg Kurz <>, zhibin hu <>
Subject: CVE-2018-19364 Qemu: 9pfs: Use-after-free due to race condition
 while updating fid path


A use-after-free flaw was found in the VirtFS, host directory sharing via Plan 
9 File System(9pfs) support in QEMU. It could occur due to a race condition in 
updating fid path in worker threads via v9fs_path_copy(), while accessing 
files on a shared host directory.

A user inside guest could use this flaw to crash the QEMU process resulting in 
DoS issue.

Upstream patch:

This issue was reported by Zhibin hu.

Thank you.
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

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