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FreeBSD: xen-tools -- Unmediated PCI command register access in qemu (CVE-2015-2756)

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FreeBSD: xen-tools -- Unmediated PCI command register access in qemu (CVE-2015-2756)

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:N/I:N/A:C)
Published
04/01/2015
Created
07/25/2018
Added
07/20/2015
Modified
01/18/2016

Description

QEMU, as used in Xen 3.3.x through 4.5.x, does not properly restrict access to PCI command registers, which might allow local HVM guest users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response.

Solution(s)

  • freebsd-upgrade-package-xen-tools

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