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Vulnerability of Linux kernel: information disclosure via Powerpc Spectre-RSB

Synthesis of the vulnerability

An attacker can bypass access restrictions to data via Powerpc Spectre-RSB of the Linux kernel, in order to obtain sensitive information.
Severity of this computer vulnerability: 1/4.
Creation date: 28/11/2019.
Références of this announce: CERTFR-2019-AVI-612, CVE-2019-18660, FEDORA-2019-124a241044, FEDORA-2019-b86a7bdba0, openSUSE-SU-2019:2675-1, SUSE-SU-2019:3200-1, SUSE-SU-2019:3289-1, VIGILANCE-VUL-31018.

Description of the vulnerability

An attacker can bypass access restrictions to data via Powerpc Spectre-RSB of the Linux kernel, in order to obtain sensitive information.
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This threat alert impacts software or systems such as Fedora, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.

Our Vigil@nce team determined that the severity of this computer vulnerability bulletin is low.

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 weakness note.

Solutions for this threat

Linux kernel: version 5.4.1.
The version 5.4.1 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.3.14.
The version 5.3.14 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.87.
The version 4.19.87 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.157.
The version 4.14.157 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.204.
The version 4.9.204 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.204.
The version 4.4.204 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for Powerpc Spectre-RSB.
A patch is indicated in information sources.

Fedora 30: new kernel packages.
New packages are available:
  Fedora 30: kernel 5.3.14-200.fc30

Fedora 31: new kernel packages.
New packages are available:
  Fedora 31: kernel 5.3.14-300.fc31

openSUSE Leap 15.1: new kernel packages.
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.36.1

SUSE LE 12 SP5: new kernel packages.
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.7.1

SUSE LE 15 RTM: new kernel-azure packages (13/12/2019).
New packages are available:
  SUSE LE 15 RTM: kernel-azure 4.12.14-5.47.1
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