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Date: Fri, 20 Sep 2019 16:02:32 +0530 (IST)
From: P J P <>
To: oss security list <>
cc: Matt Delco <>
Subject: CVE-2019-14821 Kernel: KVM: OOB memory access via mmio ring buffer


An out-of-bounds access issue was found in the way Linux kernel's KVM 
hypervisor implements Coalesced MMIO write operation. It operates on a MMIO 
ring buffer 'struct kvm_coalesced_mmio' object, wherein write indices 
'ring->first' and 'ring->last' value could be supplied by a host user-space 

An unprivileged host user/process with access to '/dev/kvm' device could use 
this flaw to crash the host kernel resulting in DoS OR potentially escalate 
privileges on the system.

Upstream patch:

This issue was reported by Matt Delco of Google Inc.

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

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