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Date: Fri, 5 Feb 2021 12:45:04 +0530 (IST)
From: P J P <>
To: oss security list <>
cc: Cheolwoo Myung <>
Subject: CVE-2021-3392 QEMU: scsi: mptsas: use-after-free while processing
 io requests


A use-after-free issue was found in the Megaraid emulator of the QEMU. It 
occurs while processing SCSI i/o requests because in case of an error 
mptsas_free_request() does not dequeue request object 'req' from a pending 
requests' queue. Which later gets processed resulting in the said 
use-after-free issue. A privileged guest user may use this flaw to crash the 
QEMU process on the host resulting in DoS scenario.

Upstream patch:

This issue was reported by Cheolwoo Myung of Seoul National University.

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

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