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Vulnerability of Linux kernel: use after free via ext4_expand_extra_isize

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via ext4_expand_extra_isize() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable software: Debian, Linux, SIMATIC, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this announce: 2/4.
Creation date: 13/12/2019.
Références of this computer vulnerability: CERTFR-2020-AVI-029, CERTFR-2020-AVI-096, CVE-2019-19767, DLA-2068-1, SSB-439005, SUSE-SU-2019:3381-1, SUSE-SU-2020:0093-1, SUSE-SU-2020:0511-1, USN-4258-1, USN-4284-1, USN-4287-1, USN-4287-2, VIGILANCE-VUL-31147.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via ext4_expand_extra_isize() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This cybersecurity announce impacts software or systems such as Debian, Linux, SIMATIC, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this threat alert 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 weakness alert.

Solutions for this threat 

Linux kernel: version 5.4.2.
The version 5.4.2 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.3.15.
The version 5.3.15 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.9.211.
The version 4.9.211 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.211.
The version 4.4.211 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.16.81.
The version 3.16.81 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: patch for ext4_expand_extra_isize.
A patch is indicated in information sources.

Debian 8: new linux packages.
New packages are available:
  Debian 8: linux 3.16.81-1

SIMATIC S7-1500 CPU 1518: workaround for GNU/Linux Vulnerabilities.
A workaround is indicated in the information source.

SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.7.1

SUSE LE 15 RTM: new kernel packages (23/12/2019).
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.47.1

SUSE LE 15 SP1: new kernel-azure packages (28/02/2020).
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.27.1

Ubuntu 18.04: new linux-image-5.0.0 packages (29/01/2020).
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gcp 5.0.0.1029.33

Ubuntu: new linux-image-4.15.0 packages (19/02/2020).
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.88.80
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.88.98
  Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1069.55

Ubuntu: new linux-image-5.3.0 packages (19/02/2020).
New packages are available:
  Ubuntu 19.10: linux-image-generic 5.3.0.40.34
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.3.0.40.97

Wind River Linux: version 10.19.45.3.
The version 10.19.45.3 is fixed:
  https://support2.windriver.com/
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