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Vulnerability of Linux kernel: overload via prb_calc_retire_blk_tmo

Synthesis of the vulnerability 

An attacker can trigger an overload via prb_calc_retire_blk_tmo() of the Linux kernel, in order to trigger a denial of service.
Vulnerable software: Linux, openSUSE Leap, SLES.
Severity of this announce: 1/4.
Creation date: 04/06/2020.
Références of this computer vulnerability: CERTFR-2020-AVI-376, CERTFR-2020-AVI-462, CVE-2019-20812, openSUSE-SU-2020:0801-1, openSUSE-SU-2020:0935-1, SUSE-SU-2020:1599-1, SUSE-SU-2020:1663-1, SUSE-SU-2020:2027-1, SUSE-SU-2020:2105-1, VIGILANCE-VUL-32443.

Description of the vulnerability 

An attacker can trigger an overload via prb_calc_retire_blk_tmo() of the Linux kernel, in order to trigger a denial of service.
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This computer weakness announce impacts software or systems such as Linux, openSUSE Leap, SLES.

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

Solutions for this threat 

Linux kernel: version 5.4.7.
The version 5.4.7 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.92.
The version 4.19.92 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.161.
The version 4.14.161 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for prb_calc_retire_blk_tmo.
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-lp151.28.52.1

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 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 packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.45.1

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
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