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Vulnerability of Linux kernel: infinite loop via ext4_protect_reserved_inode

Synthesis of the vulnerability 

An attacker can trigger an infinite loop via ext4_protect_reserved_inode() of the Linux kernel, in order to trigger a denial of service.
Impacted products: Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this bulletin: 1/4.
Creation date: 17/02/2020.
Références of this threat: CERTFR-2020-AVI-119, CERTFR-2020-AVI-124, CERTFR-2020-AVI-130, CERTFR-2020-AVI-191, CERTFR-2020-AVI-252, CERTFR-2020-AVI-318, CVE-2020-8992, openSUSE-SU-2020:0336-1, SUSE-SU-2020:0511-1, SUSE-SU-2020:0558-1, SUSE-SU-2020:0559-1, SUSE-SU-2020:0560-1, SUSE-SU-2020:0580-1, SUSE-SU-2020:0649-1, SUSE-SU-2020:0667-1, SUSE-SU-2020:0688-1, SUSE-SU-2020:1255-1, USN-4318-1, USN-4324-1, USN-4342-1, USN-4344-1, VIGILANCE-VUL-31611.

Description of the vulnerability 

An attacker can trigger an infinite loop via ext4_protect_reserved_inode() of the Linux kernel, in order to trigger a denial of service.
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This vulnerability announce 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 threat is low.

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 5.5.5.
The version 5.5.5 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.21.
The version 5.4.21 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.105.
The version 4.19.105 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.182.
The version 4.14.182 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.14.182.tar.xz

Linux kernel: version 4.9.224.
The version 4.9.224 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.9.224.tar.xz

Linux kernel: version 4.4.224.
The version 4.4.224 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.4.224.tar.xz

Linux kernel: patch for ext4_protect_reserved_inode.
A patch is indicated in information sources.

openSUSE Leap 15.1: new kernel packages (13/03/2020).
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.40.1

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-azure packages (03/03/2020).
New packages are available:
  SUSE LE 12 SP4: kernel-azure 4.12.14-6.37.1

SUSE LE 12 SP4: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP4: kernel-rt 4.12.14-8.15.1

SUSE LE 12 SP5: new kernel-azure packages (03/03/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.10.1

SUSE LE 12 SP5: new kernel packages (04/03/2020).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.17.1

SUSE LE 12 SP5: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.5.1

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

SUSE LE 15 SP1: new kernel packages (03/03/2020).
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.34.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.20.1

Ubuntu 18.04 LTS: new linux-image-5.0.0 packages.
New packages are available, as indicated in information sources.

Ubuntu: new linux-image-4.15.0 azure/aws packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1077.62
  Ubuntu 16.04 LTS: linux-image-azure 4.15.0.1077.80
  Ubuntu 18.04 LTS: linux-image-aws 4.15.0.1065.67

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.96.104
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.96.87

Ubuntu: new linux-image-5.3.0 packages (29/04/2020).
New packages are available, as indicated in information sources.

Wind River Linux: version 10.19.45.7.
The version 10.19.45.7 is fixed:
  https://support2.windriver.com/
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