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Vulnerability of Linux kernel: NULL pointer dereference via unregister_snap_client

Synthesis of the vulnerability

An attacker can force a NULL pointer to be dereferenced via unregister_snap_client of the Linux kernel, in order to trigger a denial of service.
Severity of this alert: 1/4.
Creation date: 25/11/2019.
Références of this alert: CERTFR-2019-AVI-612, CERTFR-2019-AVI-639, CERTFR-2019-AVI-652, CERTFR-2020-AVI-029, CVE-2019-19227, openSUSE-SU-2019:2675-1, SSA:2020-008-01, SUSE-SU-2019:3200-1, SUSE-SU-2019:3289-1, SUSE-SU-2019:3316-1, SUSE-SU-2019:3317-1, SUSE-SU-2019:3371-1, SUSE-SU-2019:3372-1, SUSE-SU-2019:3381-1, SUSE-SU-2020:0093-1, VIGILANCE-VUL-30953.

Description of the vulnerability

An attacker can force a NULL pointer to be dereferenced via unregister_snap_client of the Linux kernel, in order to trigger a denial of service.
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This security weakness impacts software or systems such as Linux, openSUSE Leap, Slackware, SUSE Linux Enterprise Desktop, SLES.

Our Vigil@nce team determined that the severity of this threat bulletin 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 threat.

Solutions for this threat

Linux kernel: version 4.19.89.
The version 4.19.89 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.159.
The version 4.14.159 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.207.
The version 4.9.207 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.207.
The version 4.4.207 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.16.79.
The version 3.16.79 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: patch for unregister_snap_client.
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-lp151.28.36.1

Slackware 14.2: new kernel packages.
New packages are available:
  Slackware 14.2: kernel 4.4.208-*-1

SUSE LE 12 SP4: new kernel-azure packages (18/12/2019).
New packages are available:
  SUSE LE 12 SP4: kernel-azure 4.12.14-6.34.1

SUSE LE 12 SP4: new kernel packages (20/12/2019).
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.45.1

SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.7.1

SUSE LE 12 SP5: new kernel packages (09/12/2019).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.7.1

SUSE LE 15 RTM: new kernel-azure packages (13/12/2019).
New packages are available:
  SUSE LE 15 RTM: kernel-azure 4.12.14-5.47.1

SUSE LE 15 RTM: new kernel packages (23/12/2019).
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.47.1

SUSE LE 15 SP1: new kernel-azure packages (20/12/2019).
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.22.1

SUSE LE 15 SP1: new kernel packages (18/12/2019).
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.29.1
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