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Vulnerability of Linux kernel: privilege escalation via kvm_ioctl_create_device

Synthesis of the vulnerability

An attacker can bypass restrictions via kvm_ioctl_create_device() of the Linux kernel, in order to escalate his privileges.
Severity of this weakness: 2/4.
Creation date: 13/02/2019.
Références of this bulletin: CERTFR-2019-AVI-131, CERTFR-2019-AVI-145, CERTFR-2019-AVI-183, CERTFR-2019-AVI-233, CERTFR-2019-AVI-451, CERTFR-2019-AVI-592, CERTFR-2020-AVI-030, CVE-2019-6974, DLA-1731-1, DLA-1731-2, DLA-1771-1, FEDORA-2019-164946aa7f, FEDORA-2019-3da64f3e61, K11186236, openSUSE-SU-2019:0203-1, RHSA-2019:0818-01, RHSA-2019:0833-01, RHSA-2019:2809-01, RHSA-2019:3967-01, RHSA-2020:0103-01, SUSE-SU-2019:0541-1, SUSE-SU-2019:0765-1, SUSE-SU-2019:0767-1, SUSE-SU-2019:0828-1, SUSE-SU-2019:0901-1, SUSE-SU-2019:1289-1, USN-3930-1, USN-3930-2, USN-3931-1, USN-3931-2, USN-3932-1, USN-3932-2, USN-3933-1, USN-3933-2, VIGILANCE-VUL-28494.

Description of the vulnerability

An attacker can bypass restrictions via kvm_ioctl_create_device() of the Linux kernel, in order to escalate his privileges.
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This security announce impacts software or systems such as Debian, BIG-IP Hardware, TMOS, Fedora, Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, 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 4.20.8.
The version 4.20.8 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.19.21.
The version 4.19.21 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.99.
The version 4.14.99 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.156.
The version 4.9.156 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.176.
The version 4.4.176 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.18.136.
The version 3.18.136 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: version 3.16.64.
The version 3.16.64 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

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

Debian 8: new linux-4.9 packages.
New packages are available:
  Debian 8: linux-4.9 4.9.168-1~deb8u1

Debian 8: new linux packages (27/03/2019).
New packages are available:
  Debian 8: linux 3.16.64-2

F5 BIG-IP: fixed versions for Linux KVM.
Fixed versions are indicated in information sources.

Fedora 29: new kernel packages.
New packages are available:
  Fedora 29: kernel 4.20.8-200.fc29

Fedora: new kernel-headers packages.
New packages are available:
  Fedora 28: kernel-headers 4.20.8-100.fc28
  Fedora 29: kernel-headers 4.20.8-200.fc29

Fedora: new kernel-tools packages.
New packages are available:
  Fedora 28: kernel-tools 4.20.8-100.fc28
  Fedora 29: kernel-tools 4.20.8-200.fc29

openSUSE Leap 15.0: new kernel packages.
New packages are available:
  openSUSE Leap 15.0: kernel 4.12.14-lp150.12.48.1

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 3.10.0-862.44.2.el7

RHEL 7: new kernel-alt packages.
New packages are available:
  RHEL 7: kernel-alt 4.14.0-115.12.1.el7a

RHEL 7: new kernel packages.
New packages are available:
  RHEL 7: kernel 3.10.0-957.12.1.el7

RHEL 7: new kernel-rt packages.
New packages are available:
  RHEL 7: kernel-rt 3.10.0-957.12.1.rt56.927.el7

SUSE LE 12 SP1: new kernel packages.
New packages are available:
  SUSE LE 12 SP1: kernel 3.12.74-60.64.110.1

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.104.1

SUSE LE 12 SP3: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP3: kernel-azure 4.4.176-4.25.1

SUSE LE 12 SP3: new kernel packages (05/03/2019).
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.175-94.79.1

SUSE LE 12 SP4: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP4: kernel-azure 4.12.14-6.9.1

SUSE LE 12 SP4: new kernel packages (27/03/2019).
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.13.1

Ubuntu: new linux-image-3.13.0 packages.
New packages are available:
  Ubuntu 14.04 LTS: linux-image-generic 3.13.0.168.179
  Ubuntu 12.04 ESM: linux-image-generic-lts-trusty 3.13.0.168.157

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 14.04 LTS: linux-image-azure 4.15.0.1041.28
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.47.68
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.47.49

Ubuntu: new linux-image-4.18.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 4.18.0.17.67
  Ubuntu 18.10: linux-image-generic 4.18.0.17.18

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 14.04 LTS: linux-image-generic-lts-xenial 4.4.0.144.127
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.145.153

Wind River Linux: solution (21/05/2019).
The solution is indicated in information sources.
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