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Vulnerability of Linux kernel: information disclosure via Indirect Branch Prediction Barrier

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via Indirect Branch Prediction Barrier of the Linux kernel, in order to obtain sensitive information.
Vulnerable systems: Debian, Fedora, Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 1/4.
Creation date: 19/06/2020.
Références of this weakness: CERTFR-2020-AVI-383, CERTFR-2020-AVI-459, CERTFR-2020-AVI-460, CERTFR-2020-AVI-462, CERTFR-2020-AVI-466, CERTFR-2020-AVI-474, CERTFR-2020-AVI-483, CERTFR-2020-AVI-504, CERTFR-2020-AVI-541, CERTFR-2020-AVI-547, CVE-2020-10767, DLA-2323-1, DLA-2324-1, FEDORA-2020-125ccdc871, FEDORA-2020-1b2dae6219, openSUSE-SU-2020:0935-1, openSUSE-SU-2020:1153-1, RHBUG-1845867, RHSA-2020:3010-01, RHSA-2020:3016-01, RHSA-2020:3041-01, RHSA-2020:3073-01, RHSA-2020:3222-01, RHSA-2020:3297-01, SUSE-SU-2020:1693-1, SUSE-SU-2020:1699-1, SUSE-SU-2020:1713-1, SUSE-SU-2020:2027-1, SUSE-SU-2020:2103-1, SUSE-SU-2020:2105-1, SUSE-SU-2020:2106-1, SUSE-SU-2020:2107-1, SUSE-SU-2020:2121-1, SUSE-SU-2020:2134-1, SUSE-SU-2020:2156-1, SUSE-SU-2020:2478-1, SUSE-SU-2020:2487-1, USN-4427-1, USN-4439-1, USN-4440-1, USN-4483-1, USN-4485-1, VIGILANCE-VUL-32582.

Description of the vulnerability 

An attacker can bypass access restrictions to data via Indirect Branch Prediction Barrier of the Linux kernel, in order to obtain sensitive information.
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This cybersecurity threat impacts software or systems such as Debian, Fedora, Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer threat note 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 security threat.

Solutions for this threat 

Linux kernel: version 5.7.3.
The version 5.7.3 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.6.19.
The version 5.6.19 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.47.
The version 5.4.47 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.129.
The version 4.19.129 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.185.
The version 4.14.185 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.228.
The version 4.9.228 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.228.
The version 4.4.228 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for Indirect Branch Prediction Barrier.
A patch is indicated in information sources.

Debian 9: new linux-4.19 packages.
New packages are available:
  Debian 9: linux-4.19 4.19.132-1~deb9u1

Fedora 31: new kernel packages.
New packages are available:
  Fedora 31: kernel 5.6.19-200.fc31

Fedora 32: new kernel packages.
New packages are available:
  Fedora 32: kernel 5.6.19-300.fc32

openSUSE Leap 15.1: new kernel packages (07/08/2020).
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.59.1

openSUSE Leap 15.2: new kernel packages.
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.20.7.1

RHEL 8.0: new kernel packages.
New packages are available:
  RHEL 8.0: kernel 4.18.0-80.27.1.el8_0

RHEL 8.1: new kernel packages.
New packages are available:
  RHEL 8.1: kernel 4.18.0-147.24.2.el8_1

RHEL 8.1: new kpatch-patch packages.
New packages are available:
  RHEL 8.1: kpatch-patch 4_18_0-147-1-16.el8

RHEL 8.2: new kernel packages.
New packages are available:
  RHEL 8.2: kernel 4.18.0-193.13.2.el8_2

RHEL 8.2: new kernel-rt packages.
New packages are available:
  RHEL 8.2: kernel-rt 4.18.0-193.13.2.rt13.65.el8_2

RHEL 8.2: new kpatch-patch packages.
New packages are available:
  RHEL 8.2: kpatch-patch 4_18_0-193_1_2-1-3.el8_2

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.138.1

SUSE LE 12 SP3: new kernel packages.
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.180-94.124.1

SUSE LE 12 SP4: new kernel packages.
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.57.1

SUSE LE 12 SP4: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP4: kernel-rt 4.12.14-8.23.1

SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.19.1

SUSE LE 12 SP5: new kernel packages.
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.26.1

SUSE LE 12 SP5: new kernel-rt packages (03/09/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.13.1

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.55.1

SUSE LE 15 SP1: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.38.1

SUSE LE 15 SP1: new kernel packages (04/08/2020).
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.48.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.28.1

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.5.1

SUSE LE 15 SP2: new kernel packages.
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.9.1

Ubuntu 18.0: new linux-image-5.0.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gke-5.0 5.0.0.1045.30

Ubuntu 18.0: new linux-image-5.3.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gcp 5.3.0.1032.26

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1093.70
  Ubuntu 16.04 LTS: linux-image-gcp 4.15.0.1081.83
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.115.103

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.186.163
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.186.192

Ubuntu: new linux-image-5.4.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gcp 5.4.0.1022.9
  Ubuntu 20.04 LTS: linux-image-generic 5.4.0.45.49
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