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Vulnerability of Linux kernel: buffer overflow via KVM_GET_EMULATED_CPUID

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via KVM_GET_EMULATED_CPUID of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable products: Debian, Fedora, Linux, openSUSE Leap, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this weakness: 2/4.
Creation date: 11/12/2019.
Références of this bulletin: CERTFR-2019-AVI-639, CERTFR-2019-AVI-655, CERTFR-2020-AVI-029, CERTFR-2020-AVI-060, CERTFR-2020-AVI-096, CERTFR-2020-AVI-119, CERTFR-2020-AVI-123, CERTFR-2020-AVI-124, CERTFR-2020-AVI-130, CVE-2019-19332, DLA-2068-1, DLA-2114-1, FEDORA-2019-39e97683e8, openSUSE-SU-2020:0336-1, 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, USN-4254-1, USN-4254-2, USN-4258-1, USN-4284-1, USN-4287-1, USN-4287-2, VIGILANCE-VUL-31122.

Description of the vulnerability 

An attacker can trigger a buffer overflow via KVM_GET_EMULATED_CPUID of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This computer weakness impacts software or systems such as Debian, Fedora, Linux, openSUSE Leap, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this vulnerability note 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 cybersecurity threat.

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 3.16.79.
The version 3.16.79 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

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

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

Debian 8: new linux packages.
New packages are available:
  Debian 8: linux 3.16.81-1

Fedora 31: new kernel packages.
New packages are available:
  Fedora 31: kernel 5.3.16-300.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

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

Ubuntu 18.04: new linux-image-5.0.0 packages (29/01/2020).
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gcp 5.0.0.1029.33

Ubuntu: new linux-image-4.15.0 packages (19/02/2020).
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.88.80
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.88.98
  Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1069.55

Ubuntu: new linux-image-4.4.0 packages (28/01/2020).
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.173.152
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.173.181

Ubuntu: new linux-image-5.3.0 packages (19/02/2020).
New packages are available:
  Ubuntu 19.10: linux-image-generic 5.3.0.40.34
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.3.0.40.97

Wind River Linux: version 10.17.41.20.
The version 10.17.41.20 is fixed:
  https://support2.windriver.com/

Wind River Linux: version 10.18.44.15.
The version 10.18.44.15 is fixed:
  https://support2.windriver.com/

Wind River Linux: version 10.19.45.4.
The version 10.19.45.4 is fixed:
  https://support2.windriver.com/
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