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Vulnerability of Linux kernel: information disclosure via KVM MSR_IA32_TSX_CTRL

Synthesis of the vulnerability 

An attacker, inside a guest system, can bypass access restrictions to data via KVM MSR_IA32_TSX_CTRL of the Linux kernel, in order to obtain sensitive information on the host system.
Impacted products: Linux, openSUSE Leap, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES.
Severity of this bulletin: 2/4.
Creation date: 10/12/2019.
Références of this threat: CERTFR-2019-AVI-639, CERTFR-2019-AVI-655, CERTFR-2020-AVI-029, CERTFR-2020-AVI-071, CERTFR-2020-AVI-119, CERTFR-2020-AVI-124, CERTFR-2020-AVI-130, CERTFR-2020-AVI-157, CERTFR-2020-AVI-210, CVE-2019-19338, openSUSE-SU-2020:0336-1, RHSA-2020:0328-01, RHSA-2020:0339-01, RHSA-2020:0834-01, RHSA-2020:0839-01, RHSA-2020:1465-01, SSA:2020-008-01, SUSE-SU-2019:3316-1, SUSE-SU-2019:3379-1, SUSE-SU-2019:3381-1, SUSE-SU-2019:3389-1, SUSE-SU-2020:0093-1, SUSE-SU-2020:0511-1, SUSE-SU-2020:0560-1, SUSE-SU-2020:0599-1, VIGILANCE-VUL-31107.

Description of the vulnerability 

An attacker, inside a guest system, can bypass access restrictions to data via KVM MSR_IA32_TSX_CTRL of the Linux kernel, in order to obtain sensitive information on the host system.
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This security vulnerability impacts software or systems such as Linux, openSUSE Leap, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES.

Our Vigil@nce team determined that the severity of this computer weakness bulletin 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 security note.

Solutions for this threat 

Linux kernel: version 5.4.3.
The version 5.4.3 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.3.16.
The version 5.3.16 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.89.
The version 4.19.89 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.159.
The version 4.14.159 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.207.
The version 4.9.207 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.207.
The version 4.4.207 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.16.82.
The version 3.16.82 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: patch for KVM MSR_IA32_TSX_CTRL.
A patch is indicated in information sources.

openSUSE Leap 15.1: new kernel packages (13/03/2020).
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.40.1

RHEL 7.6: new kernel packages.
New packages are available:
  RHEL 7.6: kernel 3.10.0-957.48.1.el7

RHEL 7: new kernel packages.
New packages are available:
  RHEL 7.0-7.7: kernel 3.10.0-1062.18.1.el7

RHEL 7: new kernel-rt packages.
New packages are available:
  RHEL 7.0-7.7: kernel-rt 3.10.0-1062.18.1.rt56.1044.el7

RHEL 8.1: new kernel packages.
New packages are available:
  RHEL 8.1: kernel 4.18.0-147.5.1.el8_1

RHEL 8.1: new kernel-rt packages.
New packages are available:
  RHEL 8.1: kernel-rt 4.18.0-147.5.1.rt24.98.el8_1

Slackware 14.2: new kernel packages (09/01/2020).
New packages are available:
  Slackware 14.2: kernel 4.4.208-*-1

SUSE LE 12 SP3: new kernel packages (23/12/2019).
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.180-94.113.1

SUSE LE 12 SP4: new kernel-azure packages (18/12/2019).
New packages are available:
  SUSE LE 12 SP4: kernel-azure 4.12.14-6.34.1

SUSE LE 12 SP4: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP4: kernel-rt 4.12.14-8.12.1

SUSE LE 12 SP5: new kernel-azure packages (15/01/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.7.1

SUSE LE 12 SP5: new kernel packages (30/12/2019).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.12.1

SUSE LE 15 RTM: new kernel packages (23/12/2019).
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.47.1

SUSE LE 15 SP1: new kernel-azure packages (28/02/2020).
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.27.1

SUSE LE 15 SP1: new kernel packages (03/03/2020).
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.34.1
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