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Vulnerability of Linux kernel: NULL pointer dereference via mm/hugetlb.c

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via mm/hugetlb.c of the Linux kernel, in order to trigger a denial of service.
Impacted software: Debian, Linux, openSUSE Leap, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this computer vulnerability: 1/4.
Creation date: 14/09/2020.
Références of this announce: CERTFR-2020-AVI-614, CERTFR-2020-AVI-637, CERTFR-2020-AVI-699, CERTFR-2020-AVI-711, CERTFR-2020-AVI-741, CERTFR-2020-AVI-750, CERTFR-2020-AVI-764, CERTFR-2020-AVI-769, CERTFR-2020-AVI-776, CERTFR-2020-AVI-784, CVE-2020-25285, DLA-2385-1, DLA-2420-1, DLA-2420-2, openSUSE-SU-2020:1906-1, openSUSE-SU-2020:2112-1, SSA:2020-295-01, SUSE-SU-2020:3122-1, SUSE-SU-2020:3272-1, SUSE-SU-2020:3281-1, SUSE-SU-2020:3326-1, SUSE-SU-2020:3484-1, SUSE-SU-2020:3491-1, SUSE-SU-2020:3512-1, SUSE-SU-2020:3513-1, SUSE-SU-2020:3522-1, SUSE-SU-2020:3532-1, SUSE-SU-2020:3544-1, USN-4576-1, USN-4579-1, USN-4660-1, VIGILANCE-VUL-33316.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via mm/hugetlb.c of the Linux kernel, in order to trigger a denial of service.
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This computer vulnerability impacts software or systems such as Debian, Linux, openSUSE Leap, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 5.8.8.
The version 5.8.8 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.64.
The version 5.4.64 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.144.
The version 4.19.144 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.197.
The version 4.14.197 is fixed:
  http://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.236.
The version 4.9.236 is fixed:
  http://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.236.
The version 4.4.236 is fixed:
  http://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for mm/hugetlb.c.
A patch is indicated in information sources.

Debian 9: new linux-4.19 packages.
New packages are available:
  Debian 9: linux-4.19 4.19.146-1~deb9u1

Debian 9: new linux packages.
New packages are available:
  Debian 9: linux 4.9.240-2

openSUSE Leap 15.2: new kernel packages (13/11/2020).
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.50.1

openSUSE Leap 15.2: new kernel packages (30/11/2020).
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.50.1.lp152.8.10.1

Slackware 14.2: new kernel packages (22/10/2020).
New packages are available:
  Slackware 14.2: kernel 4.4.240-i586-1

SUSE LE 12 SP4: new kernel-default packages.
New packages are available:
  SUSE LE 12 SP4: kernel-default 4.12.14-95.65.1

SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.34.1

SUSE LE 12 SP5: new kernel packages.
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.51.2

SUSE LE 12 SP5: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.22.1

SUSE LE 15: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel-default-livepatch 4.12.14-150.63.1, kernel-livepatch 4_12_14-150_63-default-1-1.5.1

SUSE LE 15 SP1: new kernel-azure packages (24/11/2020).
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.52.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.67.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.41.2

SUSE LE 15 SP2: new kernel-azure packages (24/11/2020).
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.24.1

SUSE LE 15 SP2: new kernel packages.
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.34.1

SUSE LE 15 SP2: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP2: kernel-rt 5.3.18-16.1

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1100.75
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.126.125
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.126.113

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.193.169
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.193.199

Ubuntu: new linux-image-5.4.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.4.0.51.56~18.04.45
  Ubuntu 20.04 LTS: linux-image-generic 5.4.0.51.54
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