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computer vulnerability bulletin for Xen: use after free via FIFO - CVE-2016-7154

Synthesis of the vulnerability

An attacker, inside a guest system, can force the usage of a freed memory area via FIFO of Xen, in order to trigger a denial of service, and possibly to run code on the host system.
Severity of this threat: 1/4.
Creation date: 08/09/2016.
Références of this weakness: CERTFR-2016-AVI-301, CERTFR-2016-AVI-303, CTX216071, CVE-2016-7154, DSA-3663-1, openSUSE-SU-2016:2497-1, SUSE-SU-2016:2507-1, SUSE-SU-2016:2533-1, VIGILANCE-VUL-20552, XSA-188.
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Description of the vulnerability

An attacker, inside a guest system, can force the usage of a freed memory area via FIFO of Xen, in order to trigger a denial of service, and possibly to run code on the host system.
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This vulnerability bulletin impacts software or systems such as XenServer, Debian, openSUSE, SUSE Linux Enterprise Desktop, SLES, Xen.

Our Vigil@nce team determined that the severity of this security note is low.

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

An attacker with a expert ability can exploit this cybersecurity note.

Solutions for this threat

Xen: patch for FIFO.
A patch is available:
  http://xenbits.xen.org/xsa/xsa188.patch

Citrix XenServer: patch.
A patch is indicated in information sources.

Debian 8: new xen packages.
New packages are available:
  Debian 8: xen 4.4.1-9+deb8u7

openSUSE 13.2: new xen packages.
New packages are available:
  openSUSE 13.2: xen 4.4.4_05-49.1

SUSE LE 11 SP4: new xen packages (12/10/2016).
New packages are available:
  SUSE LE 11 SP4: xen 4.4.4_08_3.0.101_80-40.2

SUSE LE 12: new xen packages.
New packages are available:
  SUSE LE 12 RTM: xen 4.4.4_04-22.22.2
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