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Vulnerability of Linux kernel: use after free via show_numa_stats

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via show_numa_stats() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Impacted software: Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.
Severity of this computer vulnerability: 2/4.
Creation date: 30/11/2020.
Références of this announce: CERTFR-2020-AVI-837, CERTFR-2021-AVI-021, CERTFR-2021-AVI-035, CERTFR-2021-AVI-111, CERTFR-2021-AVI-120, CVE-2019-20934, openSUSE-SU-2021:0075-1, PROJ-ZERO-1913, SUSE-SU-2020:3766-1, SUSE-SU-2020:3798-1, SUSE-SU-2021:0097-1, SUSE-SU-2021:0098-1, SUSE-SU-2021:0118-1, SUSE-SU-2021:0133-1, SUSE-SU-2021:0434-1, SUSE-SU-2021:0437-1, SUSE-SU-2021:0438-1, SUSE-SU-2021:0452-1, VIGILANCE-VUL-33994.

Description of the vulnerability 

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

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

Solutions for this threat 

Linux kernel: version 5.2.6.
The version 5.2.6 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.14.136.
The version 4.14.136 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.187.
The version 4.9.187 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.187.
The version 4.4.187 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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

openSUSE Leap 15.1: new kernel packages (18/01/2021).
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.91.1

SUSE LE 12 SP2: new kernel packages (11/02/2021).
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.149.1

SUSE LE 12 SP3: new kernel packages (15/02/2021).
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.180-94.138.1

SUSE LE 12 SP4: new kernel packages.
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.68.1

SUSE LE 12 SP5: new kernel-azure packages (13/01/2021).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.41.1

SUSE LE 12 SP5: new kernel packages (15/01/2021).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.57.1

SUSE LE 12 SP5: new kernel-rt packages (14/12/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.25.1

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.66.1

SUSE LE 15 SP1: new kernel-azure packages (13/01/2021).
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.58.1

SUSE LE 15 SP1: new kernel packages (14/01/2021).
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.78.1

SUSE LE 15 SP1: new kernel-rt packages (15/12/2020).
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.44.2
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