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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: Fedora, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.
Severity of this threat: 1/4.
Creation date: 19/06/2020.
Références of this weakness: CERTFR-2020-AVI-383, CVE-2020-10767, FEDORA-2020-125ccdc871, FEDORA-2020-1b2dae6219, openSUSE-SU-2020:0935-1, RHBUG-1845867, SUSE-SU-2020:1693-1, SUSE-SU-2020:1699-1, SUSE-SU-2020:1713-1, 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 Fedora, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.

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.

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

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 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
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