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Vulnerability of Linux kernel: privilege escalation via KVM Nested VMX

Synthesis of the vulnerability 

An attacker, inside a guest system, can bypass restrictions via KVM Nested VMX of the Linux kernel, in order to escalate his privileges on the host system.
Impacted products: Debian, Fedora, Linux, openSUSE Leap, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this bulletin: 2/4.
Creation date: 25/02/2020.
Références of this threat: CERTFR-2020-AVI-124, CERTFR-2020-AVI-154, CERTFR-2020-AVI-241, CERTFR-2020-AVI-256, CERTFR-2020-AVI-281, CERTFR-2020-AVI-295, CERTFR-2020-AVI-318, CERTFR-2020-AVI-368, CVE-2020-2732, DLA-2241-1, DLA-2241-2, DLA-2242-1, DSA-4667-1, DSA-4698-1, FEDORA-2020-227a4c0530, FEDORA-2020-fe00e12580, openSUSE-SU-2020:0336-1, RHSA-2020:2102-01, RHSA-2020:2171-01, SSA:2020-086-01, SUSE-SU-2020:0558-1, SUSE-SU-2020:0559-1, SUSE-SU-2020:0560-1, SUSE-SU-2020:0649-1, SUSE-SU-2020:0667-1, SUSE-SU-2020:0688-1, SUSE-SU-2020:1087-1, SUSE-SU-2020:1142-1, SUSE-SU-2020:1255-1, SUSE-SU-2020:1663-1, USN-4300-1, USN-4301-1, USN-4302-1, USN-4303-1, USN-4303-2, VIGILANCE-VUL-31677.

Description of the vulnerability 

An attacker, inside a guest system, can bypass restrictions via KVM Nested VMX of the Linux kernel, in order to escalate his privileges on the host system.
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This weakness announce impacts software or systems such as Debian, Fedora, Linux, openSUSE Leap, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 5.5.7.
The version 5.5.7 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.23.
The version 5.4.23 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.107.
The version 4.19.107 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.172.
The version 4.14.172 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.215.
The version 4.9.215 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.215.
The version 4.4.215 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.16.83.
The version 3.16.83 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/linux-3.16.83.tar.xz

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

Debian 10: new linux packages.
New packages are available:
  Debian 10: linux 4.19.98-1+deb10u1

Debian 8: new linux-4.9 packages.
New packages are available:
  Debian 8: linux-4.9 4.9.210-1+deb9u1~deb8u1

Debian 8: new linux packages.
New packages are available:
  Debian 8: linux 3.16.84-1

Debian 9: new linux packages.
New packages are available:
  Debian 9: linux 4.9.210-1+deb9u1

Fedora: new kernel packages.
New packages are available:
  Fedora 30: kernel 5.5.7-100.fc30
  Fedora 31: kernel 5.5.7-200.fc31

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 8: new kernel packages.
New packages are available:
  RHEL 8.2: kernel 4.18.0-193.1.2.el8_2

RHEL 8: new kernel-rt packages.
New packages are available:
  RHEL 8.2: kernel-rt 4.18.0-193.1.2.rt13.53.el8_2

Slackware 14.2: new kernel packages (27/03/2020).
New packages are available:
  Slackware 14.2: kernel 4.4.217-i586-1

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel-default 4.4.121-92.129.1

SUSE LE 12 SP4: new kernel-azure packages (03/03/2020).
New packages are available:
  SUSE LE 12 SP4: kernel-azure 4.12.14-6.37.1

SUSE LE 12 SP4: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP4: kernel-rt 4.12.14-8.15.1

SUSE LE 12 SP5: new kernel-azure packages (03/03/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.10.1

SUSE LE 12 SP5: new kernel-default-kgraft packages.
New packages are available:
  SUSE LE 12 SP5: kernel-default-kgraft 4.12.14-122.20.1

SUSE LE 12 SP5: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.5.1

SUSE LE 15: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.52.1

SUSE LE 15 SP1: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.30.1

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

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.20.1

Ubuntu 18.04: new linux-image-5.0.0 packages (17/03/2020).
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gcp 5.0.0.1033.37

Ubuntu: new linux-image-4.15.0 packages (17/03/2020).
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.91.101
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.91.83

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.176.155
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.176.184

Ubuntu: new linux-image-5.3.0 packages (17/03/2020).
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.3.0.42.99
  Ubuntu 19.10: linux-image-generic 5.3.0.42.36
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