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Vulnerability of Linux kernel: use after free via cdev_put

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via cdev_put() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Impacted systems: Debian, Linux, openSUSE Leap, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this alert: 1/4.
Creation date: 21/04/2020.
Références of this alert: CERTFR-2020-AVI-318, CERTFR-2020-AVI-368, CERTFR-2020-AVI-376, CERTFR-2020-AVI-547, CVE-2020-10690, DLA-2241-1, DLA-2241-2, openSUSE-SU-2020:0801-1, SSA:2020-163-01, SUSE-SU-2020:1255-1, SUSE-SU-2020:14393-1, SUSE-SU-2020:1599-1, SUSE-SU-2020:1663-1, SUSE-SU-2020:2156-1, SUSE-SU-2020:2478-1, SUSE-SU-2020:2487-1, USN-4419-1, VIGILANCE-VUL-32075.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via cdev_put() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This security vulnerability impacts software or systems such as Debian, Linux, openSUSE Leap, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

The trust level is of type confirmed by the editor, with an origin of privileged shell.

An attacker with a expert ability can exploit this security note.

Solutions for this threat 

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

Debian 8: new linux packages.
New packages are available:
  Debian 8: linux 3.16.84-1

openSUSE Leap 15.1: new kernel packages.
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.52.1

Slackware 14.2: new kernel packages.
New packages are available:
  Slackware 14.2: kernel 4.4.227-i586-1

SUSE LE 11 SP4: new kernel packages (10/06/2020).
New packages are available:
  SUSE LE 11 SP4: kernel 3.0.101-108.114.1

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel-default 4.4.121-92.129.1

SUSE LE 12 SP4: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP4: kernel-rt 4.12.14-8.23.1

SUSE LE 12 SP5: new kernel-rt packages (03/09/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.13.1

SUSE LE 15: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.52.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.45.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.28.1

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.185.162
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.185.191

Wind River Linux: version 10.18.44.17.
The version 10.18.44.17 is fixed:
  https://support2.windriver.com/

Wind River Linux: version 10.19.45.8.
The version 10.19.45.8 is fixed.
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