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Vulnerability of Linux kernel: privilege escalation via KVM sgdt/sidt/fxsave/fxrstor

Synthesis of the vulnerability 

An attacker, inside a guest system, can bypass restrictions via KVM sgdt/sidt/fxsave/fxrstor of the Linux kernel, in order to escalate his privileges on the host system.
Impacted software: QRadar SIEM, Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Synology DS***, Synology RS***, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 03/09/2018.
Références of this announce: 1103505, CERTFR-2018-AVI-460, CERTFR-2018-AVI-462, CERTFR-2018-AVI-480, CERTFR-2018-AVI-508, CERTFR-2019-AVI-188, CERTFR-2020-AVI-007, CERTFR-2020-AVI-030, CERTFR-2020-AVI-051, CVE-2018-10853, openSUSE-SU-2019:1407-1, RHSA-2019:2029-01, RHSA-2019:2043-01, RHSA-2020:0036-01, RHSA-2020:0103-01, RHSA-2020:0179-01, SUSE-SU-2018:2908-1, SUSE-SU-2018:2908-2, SUSE-SU-2018:3083-1, SUSE-SU-2018:3084-1, SUSE-SU-2019:1245-1, USN-3777-1, USN-3777-2, USN-3777-3, VIGILANCE-VUL-27130.

Description of the vulnerability 

An attacker, inside a guest system, can bypass restrictions via KVM sgdt/sidt/fxsave/fxrstor of the Linux kernel, in order to escalate his privileges on the host system.
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This security announce impacts software or systems such as QRadar SIEM, Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Synology DS***, Synology RS***, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 4.16.16.
The version 4.16.16 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.17.2.
The version 4.17.2 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.50.
The version 4.14.50 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.16.58.
The version 3.16.58 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: patch for KVM sgdt/sidt/fxsave/fxrstor.
A patch is indicated in information sources.

IBM QRadar SIEM: patch for Kernel.
A patch is indicated in information sources.

openSUSE Leap 42.3: new kernel packages.
New packages are available:
  openSUSE Leap 42.3: kernel 4.4.179-99.1

RHEL 7.4: new kernel packages.
New packages are available:
  RHEL 7.4: kernel 3.10.0-693.62.1.el7

RHEL 7.5: new kernel packages.
New packages are available:
  RHEL 7.0-7.7: kernel 3.10.0-862.46.1.el7

RHEL 7.6: new kernel packages.
New packages are available:
  RHEL 7.6: kernel 3.10.0-957.43.1.el7

RHEL 7: new kernel packages.
New packages are available:
  RHEL 7: kernel 3.10.0-1062.el7

RHEL 7: new kernel-rt packages.
New packages are available:
  RHEL 7: kernel-rt 3.10.0-1062.rt56.1022.el7

SUSE LE 12 RTM: new kernel packages.
New packages are available:
  SUSE LE 12 RTM: kernel default-3.12.61-52.146.1

SUSE LE 12 SP1: new kernel packages.
New packages are available:
  SUSE LE 12 SP1: kernel 3.12.74-60.64.104.1

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.95.1

SUSE LE 12 SP3: new kernel packages.
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.178-94.91.2

Synology DSM: version 6.2.2-24922.
The version 6.2.2-24922 is fixed.

Synology DS/RS: version 6.2.2-24922.
The version 6.2.2-24922 is fixed:
  https://www.synology.com/

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.36.59
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.36.38

Wind River Linux: solution (16/10/2018).
The solution is indicated in information sources.
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