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Vulnerability of Linux kernel: memory corruption via Power8 KVM

Synthesis of the vulnerability 

An attacker, inside a guest system, can trigger a memory corruption via Power8 KVM of the Linux kernel, in order to trigger a denial of service, and possibly to run code on the host system.
Vulnerable products: Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this weakness: 2/4.
Creation date: 07/04/2020.
Références of this bulletin: CERTFR-2020-AVI-191, CERTFR-2020-AVI-241, CERTFR-2020-AVI-242, CERTFR-2020-AVI-256, CERTFR-2020-AVI-415, CVE-2020-8834, openSUSE-SU-2020:0543-1, RHSA-2020:2854-01, SUSE-SU-2020:1084-1, SUSE-SU-2020:1085-1, SUSE-SU-2020:1087-1, SUSE-SU-2020:1118-1, SUSE-SU-2020:1119-1, SUSE-SU-2020:1123-1, SUSE-SU-2020:1141-1, SUSE-SU-2020:1142-1, SUSE-SU-2020:1146-1, SUSE-SU-2020:1663-1, USN-4318-1, VIGILANCE-VUL-31944.

Description of the vulnerability 

An attacker, inside a guest system, can trigger a memory corruption via Power8 KVM of the Linux kernel, in order to trigger a denial of service, and possibly to run code on the host system.
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This vulnerability alert impacts software or systems such as Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

Solutions for this threat 

Linux kernel: patch for Power8 KVM.
A patch is indicated in information sources.

openSUSE Leap 15.1: new kernel packages.
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.48.1

RHEL 7: new kernel-alt packages.
New packages are available:
  RHEL 7.0-7.8: kernel-alt 4.14.0-115.26.1.el7a

SUSE LE 12 SP4: new kernel-default-kgraft packages.
New packages are available:
  SUSE LE 12 SP4: kernel-default-kgraft 4.12.14-95.51.1

SUSE LE 12 SP4: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP4: kernel-rt 4.12.14-8.18.1

SUSE LE 12 SP4, SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.13.1
  SUSE LE 12 SP4: kernel-azure 4.12.14-6.40.1

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 4.12.14-10.8.1

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.
New packages are available, as indicated in information sources.

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.23.1

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.96.104
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.96.87
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