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Vulnerability of FreeBSD: out-of-bounds memory reading via bhyve pci_xhci_device_doorbell

Synthesis of the vulnerability 

An attacker can force a read at an invalid address via bhyve pci_xhci_device_doorbell() of FreeBSD, in order to trigger a denial of service, or to obtain sensitive information.
Impacted software: FreeBSD, pfSense.
Severity of this computer vulnerability: 2/4.
Creation date: 25/07/2019.
Références of this announce: CVE-2019-5604, FreeBSD-SA-19:16.bhyve, VIGILANCE-VUL-29878.

Description of the vulnerability 

An attacker can force a read at an invalid address via bhyve pci_xhci_device_doorbell() of FreeBSD, in order to trigger a denial of service, or to obtain sensitive information.
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This computer weakness bulletin impacts software or systems such as FreeBSD, pfSense.

Our Vigil@nce team determined that the severity of this computer threat announce is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this threat announce.

Solutions for this threat 

FreeBSD: patch for bhyve pci_xhci_device_doorbell.
A patch is available:
  https://security.FreeBSD.org/patches/SA-19:16/bhyve.patch

pfSense: version 2.4.5.
The version 2.4.5 is fixed:
  https://www.netgate.com/solutions/pfsense/
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