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Date: Tue, 19 May 2020 17:04:57 +0530 (IST)
From: P J P <>
To: oss security list <>
Subject: CVE-2020-12888 Kernel: vfio: access to disabled MMIO space of some
 devices may lead to DoS scenario


A flaw was found in the Linux kernel, where it allows userspace processes, for 
example, a guest VM, to directly access h/w devices via its VFIO driver 
modules. The VFIO modules allow users to enable or disable access to the 
devices' MMIO memory address spaces. If a user attempts to access (read/write) 
the devices' MMIO address space when it is disabled, some h/w devices issue an 
interrupt to the CPU to indicate a fatal error condition, crashing the system. 
This flaw allows a guest user or process to crash the host system resulting in 
a denial of service.

Upstream patch:

'CVE-2020-12888' requested 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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