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Vulnerability of Linux kernel: NULL pointer dereference via sound/usb/line6/driver.c

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via sound/usb/line6/driver.c of the Linux kernel, in order to trigger a denial of service.
Vulnerable products: Linux, Ubuntu.
Severity of this weakness: 1/4.
Creation date: 21/08/2019.
Références of this bulletin: CERTFR-2019-AVI-482, CVE-2019-15223, USN-4147-1, VIGILANCE-VUL-30114.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via sound/usb/line6/driver.c of the Linux kernel, in order to trigger a denial of service.
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This security alert impacts software or systems such as Linux, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 5.1.8.
The version 5.1.8 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: patch for sound/usb/line6/driver.c.
A patch is indicated in information sources.

Ubuntu: new linux-image-5.0.0 packages.
New packages are available:
  Ubuntu 19.04: linux-image-generic 5.0.0.31.32
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.0.0.31.88
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