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Vulnerability of Xen: information disclosure via Read-write Unlock Paths

Synthesis of the vulnerability 

An attacker, inside a guest system, can bypass access restrictions to data via Read-write Unlock Paths of Xen, in order to obtain sensitive information on the host system.
Impacted systems: Debian, Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.
Severity of this alert: 1/4.
Creation date: 14/04/2020.
Références of this alert: CERTFR-2020-AVI-205, CVE-2020-11739, DSA-4723-1, FEDORA-2020-295ed0b1e0, FEDORA-2020-cbc3149753, openSUSE-SU-2020:0599-1, SUSE-SU-2020:1124-1, SUSE-SU-2020:1138-1, SUSE-SU-2020:1139-1, SUSE-SU-2020:1630-1, SUSE-SU-2020:1634-1, VIGILANCE-VUL-32009, XSA-314.

Description of the vulnerability 

An attacker, inside a guest system, can bypass access restrictions to data via Read-write Unlock Paths of Xen, in order to obtain sensitive information on the host system.
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This security weakness impacts software or systems such as Debian, Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.

Our Vigil@nce team determined that the severity of this threat bulletin is low.

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.

Solutions for this threat 

Xen: patch for Read-write Unlock Paths.
A patch is available:
  http://xenbits.xen.org/xsa/xsa314.patch
  http://xenbits.xen.org/xsa/xsa314-4.13.patch

Debian 10: new xen packages.
New packages are available:
  Debian 10: xen 4.11.4+24-gddaaccbbab-1~deb10u1

Fedora 30-31: new xen packages.
New packages are available:
  Fedora 30: xen 4.11.4-1.fc30
  Fedora 31: xen 4.12.2-3.fc31

openSUSE Leap 15.1: new xen packages.
New packages are available:
  openSUSE Leap 15.1: xen 4.12.2_04-lp151.2.15.1

SUSE LE 12 SP3: new xen packages (17/06/2020).
New packages are available:
  SUSE LE 12 SP3: xen 4.9.4_06-3.62.1

SUSE LE 12 SP4, SP5: new xen packages.
New packages are available:
  SUSE LE 12 SP4: xen 4.11.3_04-2.23.1
  SUSE LE 12 SP5: xen 4.12.2_04-3.11.1

SUSE LE 15 RTM: new xen packages.
New packages are available:
  SUSE LE 15 RTM: xen 4.10.4_10-3.31.1

SUSE LE 15 SP1: new xen packages.
New packages are available:
  SUSE LE 15 SP1: xen 4.12.2_04-3.15.1
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