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Vulnerability of Linux kernel: NULL pointer dereference via btrfs_verify_dev_extents

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via btrfs_verify_dev_extents() of the Linux kernel, in order to trigger a denial of service.
Impacted software: Debian, Linux, Ubuntu.
Severity of this computer vulnerability: 1/4.
Creation date: 15/11/2019.
Références of this announce: CERTFR-2020-AVI-060, CERTFR-2020-AVI-096, CERTFR-2020-AVI-504, CVE-2019-18885, DLA-2323-1, DLA-2324-1, USN-4254-1, USN-4254-2, USN-4258-1, USN-4287-1, USN-4287-2, VIGILANCE-VUL-30886.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via btrfs_verify_dev_extents() 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 Debian, Linux, 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 4.19.129.
The version 4.19.129 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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

Debian 9: new linux-4.19 packages.
New packages are available:
  Debian 9: linux-4.19 4.19.132-1~deb9u1

Ubuntu 18.04: new linux-image-5.0.0 packages (29/01/2020).
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gcp 5.0.0.1029.33

Ubuntu: new linux-image-4.15.0 packages (19/02/2020).
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.88.80
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.88.98
  Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1069.55

Ubuntu: new linux-image-4.4.0 packages (28/01/2020).
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.173.152
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.173.181

Wind River Linux: version 10.17.41.19.
The version 10.17.41.19 is fixed.

Wind River Linux: version 10.18.44.14.
The version 10.18.44.14 is fixed:
  https://support2.windriver.com/
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