The Vigil@nce team watches public vulnerabilities impacting your computers, and then offers security solutions, a vigilance database and tools to fix them.

Vulnerability of Linux kernel: use after free via snd_timer_open

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via snd_timer_open() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Impacted systems: Android OS, Linux, RHEL, Ubuntu.
Severity of this alert: 2/4.
Creation date: 16/12/2019.
Références of this alert: CERTFR-2020-AVI-005, CERTFR-2020-AVI-013, CERTFR-2020-AVI-046, CERTFR-2020-AVI-459, CERTFR-2020-AVI-474, CERTFR-2020-AVI-612, CVE-2019-19807, RHSA-2020:3010-01, RHSA-2020:3016-01, RHSA-2020:3222-01, RHSA-2020:4060-01, RHSA-2020:4062-01, USN-4225-1, USN-4225-2, USN-4227-1, USN-4227-2, VIGILANCE-VUL-31163.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via snd_timer_open() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This weakness bulletin impacts software or systems such as Android OS, Linux, RHEL, Ubuntu.

Our Vigil@nce team determined that the severity of this computer weakness is medium.

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 vulnerability announce.

Solutions for this threat 

Linux kernel: version 5.3.11.
The version 5.3.11 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.14.154.
The version 4.14.154 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.19.84.
The version 4.19.84 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.201.
The version 4.9.201 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.16.80.
The version 3.16.80 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

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

Google Android/Pixel: patch for April 2020.
A patch is indicated in information sources.

RHEL 7.8: new kernel packages.
New packages are available:
  RHEL 7.0-7.8: kernel 3.10.0-1160.el7

RHEL 7.8: new kernel-rt packages.
New packages are available:
  RHEL 7.0-7.8: kernel-rt 3.10.0-1160.rt56.1131.el7

RHEL 8.1: new kernel packages.
New packages are available:
  RHEL 8.1: kernel 4.18.0-147.24.2.el8_1

RHEL 8.2: new kernel packages.
New packages are available:
  RHEL 8.2: kernel 4.18.0-193.13.2.el8_2

RHEL 8.2: new kernel-rt packages.
New packages are available:
  RHEL 8.2: kernel-rt 4.18.0-193.13.2.rt13.65.el8_2

Ubuntu: new linux-image-4.15.0 packages (07/01/2020).
New packages are available:
  Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1066.52
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.74.94
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.74.76

Ubuntu: new linux-image-5.3.0 packages (07/01/2020).
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.3.0.26.95, linux-image-azure-edge 5.3.0.1009.9
  Ubuntu 19.10: linux-image-generic 5.3.0.26.30

Wind River Linux: version 10.19.45.4.
The version 10.19.45.4 is fixed:
  https://support2.windriver.com/
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