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Vulnerability of Linux kernel: NULL pointer dereference via ext4_empty_dir

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via ext4_empty_dir() of the Linux kernel, in order to trigger a denial of service.
Impacted systems: Debian, Linux.
Severity of this alert: 1/4.
Creation date: 21/11/2019.
Références of this alert: CERTFR-2020-AVI-123, CVE-2019-19037, DLA-2114-1, VIGILANCE-VUL-30923.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via ext4_empty_dir() 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.

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 5.4.7.
The version 5.4.7 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.92.
The version 4.19.92 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.161.
The version 4.14.161 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.208.
The version 4.9.208 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for ext4_empty_dir.
A patch is indicated in information sources.

Debian 8: new linux-4.9 packages.
New packages are available:
  Debian 8: linux-4.9 4.9.210-1~deb8u1

Wind River Linux: version 10.19.45.6.
The version 10.19.45.6 is fixed:
  https://support2.windriver.com/
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