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Vulnerability of Linux kernel: privilege escalation via Power9 KUAP Save/Restore

Synthesis of the vulnerability 

An attacker can bypass restrictions via Power9 KUAP Save/Restore of the Linux kernel, in order to escalate his privileges.
Impacted systems: Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this alert: 2/4.
Creation date: 13/04/2020.
Références of this alert: CERTFR-2020-AVI-241, CERTFR-2020-AVI-242, CERTFR-2020-AVI-256, CERTFR-2020-AVI-300, CVE-2020-11669, openSUSE-SU-2020:0543-1, SUSE-SU-2020:1085-1, SUSE-SU-2020:1087-1, SUSE-SU-2020:1118-1, SUSE-SU-2020:1119-1, SUSE-SU-2020:1141-1, SUSE-SU-2020:1142-1, SUSE-SU-2020:1146-1, SUSE-SU-2020:1663-1, USN-4363-1, USN-4368-1, VIGILANCE-VUL-32003.

Description of the vulnerability 

An attacker can bypass restrictions via Power9 KUAP Save/Restore of the Linux kernel, in order to escalate his privileges.
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This computer weakness announce impacts software or systems such as Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 4.19.116.
The version 4.19.116 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.177.
The version 4.14.177 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.14.177.tar.xz

Linux kernel: patch for Power9 KUAP Save/Restore.
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

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 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.

Ubuntu 18.04 LTS: new linux-image-5.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-5.0.0-1037-gke 5.0.0-1037.38, linux-image-5.0.0-1052-oem-osp1 5.0.0-1052.57, linux-image-gke-5.0 5.0.0.1037.25, linux-image-oem-osp1 5.0.0.1052.55

Ubuntu: new linux-image-4.15.0 packages.
New packages are available, as indicated in information sources.
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