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Date: Thu, 28 Jan 2021 12:29:04 +0530 (IST)
From: P J P <>
To: oss security list <>
cc: Gaoning Pan <>
Subject: CVE-2021-20196 QEMU: block: fdc: null pointer dereference may lead
 to guest crash


A NULL pointer dereference issue was found in the Floopy disk emulator of 
QEMU. It could occur while processing read/write ioport commands, if the 
selected Floopy drive is not initialised with a block device. A privileged 
guest user could use this flaw to crash the QEMU process on the host resulting 
in DoS scenario.

Upstream patch:

This issue was reported by Gaoning Pan of Zhejiang University & Ant Security 
Light-Year Lab.

Thank you.
Prasad J Pandit / Red Hat Product Security Team
8685 545E B54C 486B C6EB 271E E285 8B5A F050 DE8D

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