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Vulnerability of Linux kernel: information disclosure via mremap

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via mremap() of the Linux kernel, in order to obtain sensitive information.
Vulnerable systems: Debian, Android OS, QRadar SIEM, Linux, openSUSE Leap, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 2/4.
Creation date: 29/10/2018.
Références of this weakness: 1103505, 1695, 1798863, CERTFR-2018-AVI-541, CERTFR-2018-AVI-581, CERTFR-2018-AVI-583, CERTFR-2019-AVI-019, CERTFR-2019-AVI-035, CERTFR-2019-AVI-038, CERTFR-2019-AVI-041, CERTFR-2019-AVI-042, CERTFR-2019-AVI-044, CERTFR-2019-AVI-071, CERTFR-2019-AVI-183, CERTFR-2019-AVI-233, CERTFR-2020-AVI-007, CERTFR-2020-AVI-030, CERTFR-2020-AVI-051, CVE-2018-18281, DLA-1715-1, DLA-1731-1, DLA-1731-2, openSUSE-SU-2018:3817-1, openSUSE-SU-2018:4133-1, RHSA-2019:0831-01, RHSA-2019:2029-01, RHSA-2019:2043-01, RHSA-2020:0036-01, RHSA-2020:0100-01, RHSA-2020:0103-01, RHSA-2020:0179-01, SSA:2019-030-01, SUSE-SU-2018:3689-1, SUSE-SU-2018:3746-1, SUSE-SU-2018:3773-1, SUSE-SU-2018:4069-1, SUSE-SU-2019:0095-1, SUSE-SU-2019:0222-1, SUSE-SU-2019:0224-1, SUSE-SU-2019:0439-1, SUSE-SU-2019:1289-1, SUSE-SU-2019:13937-1, USN-3832-1, USN-3835-1, USN-3871-1, USN-3871-2, USN-3871-3, USN-3871-4, USN-3871-5, USN-3880-1, USN-3880-2, VIGILANCE-VUL-27638.

Description of the vulnerability 

An attacker can bypass access restrictions to data via mremap() of the Linux kernel, in order to obtain sensitive information.
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This weakness note impacts software or systems such as Debian, Android OS, QRadar SIEM, Linux, openSUSE Leap, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this threat note is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this computer weakness.

Solutions for this threat 

Linux kernel: version 4.18.16.
The version 4.18.16 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.78.
The version 4.14.78 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.135.
The version 4.9.135 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.163.
The version 4.4.163 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.18.125.
The version 3.18.125 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: version 3.16.62.
The version 3.16.62 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

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

Debian 8: new linux-4.9 packages.
New packages are available:
  Debian 8: linux-4.9 4.9.144-3.1~deb8u1

Debian 8: new linux packages (27/03/2019).
New packages are available:
  Debian 8: linux 3.16.64-2

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

IBM QRadar SIEM: patch for Kernel.
A patch is indicated in information sources.

openSUSE Leap 15.0: new kernel packages.
New packages are available:
  openSUSE Leap 15.0: kernel 4.12.14-lp150.12.28.1

openSUSE Leap 42.3: new kernel packages.
New packages are available:
  openSUSE Leap 42.3: kernel 4.4.162-78.1

RHEL 6 MRG: new kernel-rt packages.
New packages are available:
  RHEL 6.0-6.10: kernel-rt 3.10.0-693.62.1.rt56.659.el6rt

RHEL 7.4: new kernel packages.
New packages are available:
  RHEL 7.4: kernel 3.10.0-693.62.1.el7

RHEL 7.5: new kernel packages.
New packages are available:
  RHEL 7.0-7.7: kernel 3.10.0-862.46.1.el7

RHEL 7.6: new kernel packages.
New packages are available:
  RHEL 7.6: kernel 3.10.0-957.43.1.el7

RHEL 7: new kernel-alt packages.
New packages are available:
  RHEL 7: kernel-alt 4.14.0-115.7.1.el7a

RHEL 7: new kernel packages.
New packages are available:
  RHEL 7: kernel 3.10.0-1062.el7

RHEL 7: new kernel-rt packages.
New packages are available:
  RHEL 7: kernel-rt 3.10.0-1062.rt56.1022.el7

Slackware: new kernel packages.
New packages are available:
  Slackware 14.2: kernel 4.4.172-i586-1

SUSE LE 11 SP3: new kernel packages.
New packages are available:
  SUSE LE 11 SP3: kernel 3.0.101-0.47.106.59.1

SUSE LE 11 SP4: new kernel packages.
New packages are available:
  SUSE LE 11 SP4: kernel 3.0.101-108.81.1

SUSE LE 12 SP1: new kernel packages.
New packages are available:
  SUSE LE 12 SP1: kernel 3.12.74-60.64.110.1

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.101.1

SUSE LE 12 SP3: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP3: kernel-azure 4.4.162-4.19.2

SUSE LE 12 SP3: new kernel packages.
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.162-94.69.2

SUSE LE 12 SP3: new kernel-rt packages (16/11/2018).
New packages are available:
  SUSE LE 12 SP3: kernel-rt 4.4.162-3.29.1

SUSE LE 12 SP4: new kernel packages (04/02/2019).
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-6.6.2

SUSE LE 12 SP4: new kernel packages (11/12/2018).
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.3.1

SUSE LE 15: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-25.28.1

Ubuntu 18.04: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.45.66
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0-45.48

Ubuntu 18.10: new linux-image-4.18.0 packages.
New packages are available:
  Ubuntu 18.10: linux-image-generic 4.18.0.12.13

Ubuntu 18.10: new linux-image-aws packages.
New packages are available:
  Ubuntu 18.10: linux-image-aws 4.18.0.1006.6

Ubuntu: new linux-image-3.13.0 packages.
New packages are available:
  Ubuntu 12.04 ESM: linux-image-generic-lts-trusty 3.13.0.165.155
  Ubuntu 14.04 LTS: linux-image-generic 3.13.0.165.175

Wind River Linux: solution (28/11/2018).
The solution is indicated in information sources.
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