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Vulnerability of Linux kernel: NULL pointer dereference via __del_reloc_root

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via __del_reloc_root() of the Linux kernel, in order to trigger a denial of service.
Vulnerable products: Debian, Linux, Ubuntu.
Severity of this weakness: 1/4.
Creation date: 02/10/2018.
Références of this bulletin: CERTFR-2018-AVI-557, CERTFR-2019-AVI-391, CERTFR-2019-AVI-419, CVE-2018-14609, DLA-1529-1, DLA-1531-1, DSA-4308-1, USN-3821-1, USN-3821-2, USN-4094-1, USN-4118-1, VIGILANCE-VUL-27372.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via __del_reloc_root() of the Linux kernel, in order to trigger a denial of service.
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This vulnerability bulletin impacts software or systems such as Debian, Linux, Ubuntu.

Our Vigil@nce team determined that the severity of this security note 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 note.

Solutions for this threat 

Linux kernel: version 4.14.70.
The version 4.14.70 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.127.
The version 4.9.127 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.156.
The version 4.4.156 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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

Debian 8: new linux-4.9 packages.
New packages are available:
  Debian 8: linux-4.9 4.9.110-3+deb9u5~deb8u1

Debian 8: new linux packages (05/10/2018).
New packages are available:
  Debian 8: linux 3.16.59-1

Debian 9: new linux packages.
New packages are available:
  Debian 9: linux 4.9.110-3+deb9u5

Ubuntu 16/18: new linux-image-aws packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-aws 4.15.0.1047.47
  Ubuntu 18.04 LTS: linux-image-aws 4.15.0.1047.46

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.58.79
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.58.60

Ubuntu: new linux-image-4.4.0-139-generic packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-4.4.0-139-generic 4.4.0-139.165
  Ubuntu 14.04 LTS: linux-image-4.4.0-139-generic 4.4.0-139.165~14.04.1
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