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Date: Thu, 17 Sep 2020 00:25:27 +0530 (IST)
From: P J P <>
To: oss security list <>
Subject: CVE-2020-25085 QEMU: sdhci: out-of-bounds access issue while doing
 multi block SDMA


An out-of-bounds r/w access issue was found in the SDHCI Controller emulator 
of QEMU. It may occur while doing multi block SDMA, if transfer block size 
exceeds the 's->fifo_buffer[s->buf_maxsz]' size. It'd leave the current 
element pointer 's->data_count' pointing out of bounds. Leading the subsequent 
DMA r/w operation to OOB access issue. A guest user/process may use this flaw 
to crash the QEMU process resulting in DoS scenario.

Upstream patches:

* This issue was reported by Sergej Schumilo, Cornelius Aschermann, Simon
   Wrner of Ruhr-University Bochum.

* 'CVE-2020-25085' assigned via

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

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