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Vulnerability of Linux kernel: NULL pointer dereference via KEYCTL_READ

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via KEYCTL_READ of the Linux kernel, in order to trigger a denial of service.
Vulnerable systems: Junos Space, Linux, RHEL, Ubuntu.
Severity of this threat: 1/4.
Creation date: 12/10/2017.
Références of this weakness: CERTFR-2017-AVI-384, CERTFR-2017-AVI-424, CERTFR-2017-AVI-426, CVE-2017-12192, JSA11110, RHSA-2018:0151-01, RHSA-2020:2430-01, USN-3469-1, USN-3469-2, USN-3487-1, USN-3583-1, USN-3583-2, VIGILANCE-VUL-24110.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via KEYCTL_READ of the Linux kernel, in order to trigger a denial of service.
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This threat alert impacts software or systems such as Junos Space, Linux, RHEL, Ubuntu.

Our Vigil@nce team determined that the severity of this computer vulnerability 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 weakness note.

Solutions for this threat 

Linux kernel: version 4.1.46.
The version 4.1.46 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.16.50.
The version 3.16.50 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

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

Juniper Junos Space: version 20.3R1.
The version 20.3R1 is fixed:
  https://www.juniper.net/support/downloads/

RHEL 6: new kernel packages.
New packages are available:
  RHEL 6.0-6.10: kernel 2.6.32-754.30.2.el6

RHEL 7: new kernel packages.
New packages are available:
  RHEL 7: kernel 3.10.0-693.17.1.el7

Ubuntu 17.10: new linux-image-4.13.0 packages.
New packages are available:
  Ubuntu 17.10: linux-image-4.13.0-17-generic 4.13.0-17.20

Ubuntu: new linux-image-3.13 packages.
New packages are available:
  Ubuntu 14.04 LTS: linux-image-3.13.0-142-generic-lpae 3.13.0-142.191
  Ubuntu 12.04 ESM: linux-image-3.13.0-142-generic-lpae 3.13.0-142.191~precise1

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.98.103
  Ubuntu 14.04 LTS: linux-image-generic-lts-xenial 4.4.0.98.82
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