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weakness note CVE-2019-12819

Linux kernel: use after free via fixed_mdio_bus_init

Synthesis of the vulnerability

An attacker can force the usage of a freed memory area via fixed_mdio_bus_init() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Severity of this announce: 2/4.
Creation date: 14/06/2019.
Références of this computer vulnerability: CERTFR-2019-AVI-330, CERTFR-2019-AVI-337, CERTFR-2019-AVI-391, CERTFR-2019-AVI-419, CERTFR-2019-AVI-458, CVE-2019-12819, openSUSE-SU-2019:1570-1, openSUSE-SU-2019:1571-1, openSUSE-SU-2019:1579-1, SUSE-SU-2019:1550-1, SUSE-SU-2019:1823-1, SUSE-SU-2019:1823-2, SUSE-SU-2019:1851-1, SUSE-SU-2019:1852-1, SUSE-SU-2019:1855-1, SUSE-SU-2019:2430-1, SUSE-SU-2019:2450-1, USN-4094-1, USN-4118-1, VIGILANCE-VUL-29533.
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Description of the vulnerability

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

Our Vigil@nce team determined that the severity of this cybersecurity note 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 note.

Solutions for this threat

Linux kernel: version 4.20.17.
The version 4.20.17 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.19.30.
The version 4.19.30 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.107.
The version 4.14.107 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.164.
The version 4.9.164 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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

openSUSE Leap 15.0: new kernel packages.
New packages are available:
  openSUSE Leap 15.0: kernel 4.12.14-lp150.12.64.1

openSUSE Leap 15.1: new kernel packages.
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.7.1

openSUSE Leap 42.3: new kernel packages.
New packages are available:
  openSUSE Leap 42.3: kernel 4.4.180-102.1

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.117.1

SUSE LE 12 SP3: new kernel packages.
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.180-94.100.1

SUSE LE 12 SP4: new kernel packages (16/07/2019).
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.24.1

SUSE LE 12 SP4: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP4: kernel-rt 4.12.14-8.3.1

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.27.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.4.1

SUSE LE 15 SP1: new kernel-source-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-source-rt 4.12.14-14.8.1

Ubuntu 16/18: new linux-image-aws packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-aws 4.15.0.1047.47
  Ubuntu 18.04 LTS: linux-image-aws 4.15.0.1047.46

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.58.79
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.58.60

Wind River Linux: version 10.18.44.9.
The version 10.18.44.9 is fixed:
  https://support2.windriver.com/
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