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Vulnerability of Linux kernel: denial of service via Netfilter Memory Barriers

Synthesis of the vulnerability 

An attacker can trigger a fatal error via Netfilter Memory Barriers of the Linux kernel, in order to trigger a denial of service.
Impacted systems: Fedora, Linux, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this alert: 1/4.
Creation date: 31/03/2021.
Références of this alert: CVE-2021-29650, FEDORA-2021-2306e89112, FEDORA-2021-6b0f287b8b, SUSE-SU-2021:14724-1, SUSE-SU-2021:1571-1, SUSE-SU-2021:1572-1, SUSE-SU-2021:1573-1, SUSE-SU-2021:1574-1, USN-4945-1, USN-4946-1, USN-4947-1, USN-4948-1, USN-4949-1, VIGILANCE-VUL-34985.

Description of the vulnerability 

An attacker can trigger a fatal error via Netfilter Memory Barriers of the Linux kernel, in order to trigger a denial of service.
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This computer threat announce impacts software or systems such as Fedora, Linux, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 5.11.11.
The version 5.11.11 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.10.27.
The version 5.10.27 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.109.
The version 5.4.109 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.184.
The version 4.19.184 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for Netfilter Memory Barriers.
A patch is indicated in information sources.

Fedora 32-33: new kernel-headers packages.
New packages are available:
  Fedora 32: kernel-headers 5.11.11-100.fc32
  Fedora 33: kernel-headers 5.11.11-200.fc33

Fedora 32-33: new kernel packages.
New packages are available:
  Fedora 32: kernel 5.11.11-100.fc32
  Fedora 33: kernel 5.11.11-200.fc33

Fedora 32-33: new kernel-tools packages.
New packages are available:
  Fedora 32: kernel-tools 5.11.11-100.fc32
  Fedora 33: kernel-tools 5.11.11-200.fc33

SUSE LE 11 SP4: new kernel packages.
New packages are available:
  SUSE LE 11 SP4: kernel 3.0.101-108.126.1

SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.56.1

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.72.1

SUSE LE 15 SP2: new kernel packages.
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.64.1

SUSE LE 15 SP2: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP2: kernel-rt 5.3.18-36.2

Ubuntu: new linux-image-4.15.0 packages.
New packages are available, as indicated in information sources.

Ubuntu: new linux-image-5.10,0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-5.10.0-1026-oem 5.10.0-1026.27, linux-image-oem-20.04b 5.10.0.1026.27

Ubuntu: new linux-image-5.4.0 packages.
New packages are available, as indicated in information sources.

Ubuntu: new linux-image-5.6,0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-5.6.0-1056-oem 5.6.0-1056.60, linux-image-oem-20.04 5.6.0.1056.52

Ubuntu: new linux-image-5.8,0 packages.
New packages are available, as indicated in information sources.
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