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Vulnerability of Linux kernel: denial of service via xfs

Synthesis of the vulnerability 

An attacker can trigger long delay in a xfs operation of the Linux kernel, in order to trigger a denial of service.
Vulnerable products: Debian, Fedora, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this weakness: 1/4.
Creation date: 20/05/2020.
Références of this bulletin: CERTFR-2020-AVI-376, CERTFR-2020-AVI-504, CERTFR-2020-AVI-522, CERTFR-2020-AVI-529, CERTFR-2020-AVI-541, CERTFR-2020-AVI-547, CVE-2020-12655, DLA-2323-1, DLA-2324-1, FEDORA-2020-4336d63533, FEDORA-2020-5a69decc0c, FEDORA-2020-c6b9fff7f8, openSUSE-SU-2020:0801-1, RHSA-2020:3545-01, SUSE-SU-2020:1599-1, SUSE-SU-2020:1663-1, SUSE-SU-2020:2156-1, SUSE-SU-2020:2478-1, SUSE-SU-2020:2487-1, USN-4465-1, USN-4483-1, USN-4485-1, VIGILANCE-VUL-32304.

Description of the vulnerability 

An attacker can trigger long delay in a xfs operation of the Linux kernel, in order to trigger a denial of service.
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This computer vulnerability impacts software or systems such as Debian, Fedora, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this weakness.

Solutions for this threat 

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

Fedora 30-31: new kernel packages.
New packages are available:
  Fedora 30: kernel 5.6.13-100.fc30
  Fedora 31: kernel 5.6.13-200.fc31

Fedora 32: new kernel packages.
New packages are available:
  Fedora 32: kernel 5.6.13-300.fc32

openSUSE Leap 15.1: new kernel packages.
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.52.1

RHEL 7 ARM/POWER9: new kernel-alt packages.
New packages are available:
  RHEL 7.0-7.8: kernel-alt 4.14.0-115.29.1.el7a

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

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

Ubuntu 18.04: new linux-image-5.3.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gke-5.3 5.3.0.1033.18

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-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

Wind River Linux: version 10.18.44.17.
The version 10.18.44.17 is fixed:
  https://support2.windriver.com/

Wind River Linux: version 10.19.45.10.
The version 10.19.45.10 is fixed:
  https://support2.windriver.com/index.php?page=cve&on=list&show=50&product_id=1&product_version%5B0%5D=24&id_status%5B0%5D=4&cve_id_filter=&s=&submit=&order_by=cve_modified_date&order_way=desc#list
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