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Vulnerability of Linux kernel: NULL pointer dereference via cgroup_sk_alloc

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via cgroup_sk_alloc() of the Linux kernel, in order to trigger a denial of service.
Impacted products: Debian, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this bulletin: 1/4.
Creation date: 20/08/2020.
Références of this threat: CERTFR-2020-AVI-541, CERTFR-2020-AVI-547, CERTFR-2020-AVI-548, CERTFR-2020-AVI-553, CERTFR-2020-AVI-568, CERTFR-2020-AVI-574, CERTFR-2020-AVI-585, CVE-2020-14356, DLA-2385-1, openSUSE-SU-2020:1236-1, openSUSE-SU-2020:1325-1, RHBUG-1868453, SUSE-SU-2020:2485-1, SUSE-SU-2020:2486-1, SUSE-SU-2020:2540-1, SUSE-SU-2020:2541-1, SUSE-SU-2020:2574-1, SUSE-SU-2020:2575-1, SUSE-SU-2020:2605-1, SUSE-SU-2020:2610-1, SUSE-SU-2020:2623-1, SUSE-SU-2020:2631-1, USN-4483-1, USN-4484-1, USN-4526-1, VIGILANCE-VUL-33123.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via cgroup_sk_alloc() of the Linux kernel, in order to trigger a denial of service.
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This computer vulnerability alert impacts software or systems such as Debian, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 5.7.10.
The version 5.7.10 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.53.
The version 5.4.53 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: patch for cgroup_sk_alloc.
A patch is indicated in information sources.

Debian 9: new linux-4.19 packages.
New packages are available:
  Debian 9: linux-4.19 4.19.146-1~deb9u1

openSUSE Leap 15.1: new kernel packages (03/09/2020).
New packages are available:
  openSUSE Leap 15.1: kernel debug-4.12.14-lp151.28.63.1

openSUSE Leap 15.2: new kernel packages.
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.36.1

SUSE LE 12 SP4: new kernel packages.
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.60.1

SUSE LE 12 SP5: new kernel-azure packages (07/09/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.25.1

SUSE LE 12 SP5: new kernel packages (08/09/2020).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.37.1

SUSE LE 12 SP5: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.16.1

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.58.1

SUSE LE 15 SP1: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.41.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.56.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.31.1

SUSE LE 15 SP2: new kernel packages.
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.12.1

Ubuntu 18.04: new linux-image-5.3.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-aws 5.3.0.1034.33

Ubuntu: new linux-image-4.15.0 packages (22/09/2020).
New packages are available:
  Ubuntu 18.04 LTS: linux-image-4.15.0-118-generic 4.15.0-118.119
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.118.119
  Ubuntu 14.04 ESM: linux-image-4.15.0-1096-azure 4.15.0-1096.106~14.04.1

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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