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Vulnerability of Linux kernel: use after free via allocate_trace_buffer

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via allocate_trace_buffer() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Impacted systems: Android OS, Linux, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES.
Severity of this alert: 2/4.
Creation date: 11/10/2019.
Références of this alert: CERTFR-2019-AVI-502, CERTFR-2019-AVI-503, CERTFR-2019-AVI-519, CERTFR-2019-AVI-522, CERTFR-2019-AVI-561, CERTFR-2019-AVI-575, CERTFR-2019-AVI-612, CERTFR-2019-AVI-635, CERTFR-2020-AVI-029, CERTFR-2020-AVI-281, CERTFR-2020-AVI-306, CERTFR-2020-AVI-311, CERTFR-2020-AVI-320, CVE-2017-18595, openSUSE-SU-2019:2307-1, openSUSE-SU-2019:2308-1, RHSA-2020:2082-01, RHSA-2020:2085-01, RHSA-2020:2104-01, RHSA-2020:2214-01, RHSA-2020:2242-01, RHSA-2020:2277-01, RHSA-2020:2285-01, RHSA-2020:2289-01, SUSE-SU-2019:2648-1, SUSE-SU-2019:2651-1, SUSE-SU-2019:2658-1, SUSE-SU-2019:2706-1, SUSE-SU-2019:2710-1, SUSE-SU-2019:2879-1, SUSE-SU-2019:2949-1, SUSE-SU-2019:2950-1, SUSE-SU-2019:2984-1, SUSE-SU-2019:3200-1, SUSE-SU-2019:3295-1, SUSE-SU-2020:0093-1, VIGILANCE-VUL-30599.

Description of the vulnerability 

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

Our Vigil@nce team determined that the severity of this cybersecurity threat 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 computer threat bulletin.

Solutions for this threat 

Linux kernel: version 4.14.11.
The version 4.14.11 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.74.
The version 4.9.74 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.109.
The version 4.4.109 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.18.91.
The version 3.18.91 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

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

Google Android/Pixel: patch for December 2019.
A patch is indicated in information sources.

openSUSE Leap 15: new kernel packages.
New packages are available:
  openSUSE Leap 15.0: kernel 4.12.14-lp150.12.76.1
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.20.1

RHEL 6: new kernel-rt packages.
New packages are available:
  RHEL 6.0-6.10: kernel-rt 3.10.0-693.67.1.rt56.665.el6rt

RHEL 7.6: new kernel packages.
New packages are available:
  RHEL 7.0-7.8: kernel 3.10.0-957.54.1.el7

RHEL 7: new kernel-alt packages.
New packages are available:
  RHEL 7.0-7.8: kernel-alt 4.14.0-115.21.2.el7a

RHEL 7: new kernel packages.
New packages are available:
  RHEL 7.0-7.8: kernel 3.10.0-1127.8.2.el7
  RHEL 7.2: kernel 3.10.0-327.88.1.el7
  RHEL 7.3: kernel 3.10.0-514.76.1.el7
  RHEL 7.4: kernel 3.10.0-693.67.1.el7

RHEL 7: new kernel-rt packages.
New packages are available:
  RHEL 7.0-7.8: kernel-rt 3.10.0-1127.8.2.rt56.1103.el7

SUSE LE 12 SP1: new kernel packages (13/11/2019).
New packages are available:
  SUSE LE 12 SP1: kernel 3.12.74-60.64.124.1

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.125.1

SUSE LE 12 SP3: new kernel packages (13/11/2019).
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.180-94.107.1

SUSE LE 12 SP4: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP4: kernel-azure 4.12.14-6.26.1

SUSE LE 12 SP4: new kernel packages (04/11/2019).
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.37.1

SUSE LE 12 SP5: new kernel-azure packages (15/01/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.7.1

SUSE LE 12 SP5: new kernel packages (09/12/2019).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.7.1

SUSE LE 15: new kernel-azure packages.
New packages are available:
  SUSE LE 15 RTM: kernel-azure 4.12.14-5.41.1
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.16.1

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.38.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.21.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.14.3
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