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Vulnerability of Linux kernel: information disclosure via vmacache_flush_all

Synthesis of the vulnerability 

A local attacker can read a memory fragment via vmacache_flush_all() of the Linux kernel, in order to obtain sensitive information.
Impacted systems: Debian, Fedora, Android OS, Linux, openSUSE Leap, RHEL, SIMATIC, Slackware, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Synology DS***, Synology RS***, Ubuntu.
Severity of this alert: 1/4.
Creation date: 19/09/2018.
Références of this alert: CERTFR-2018-AVI-462, CERTFR-2018-AVI-472, CERTFR-2018-AVI-480, CERTFR-2018-AVI-490, CERTFR-2018-AVI-508, CERTFR-2018-AVI-538, CERTFR-2019-AVI-019, CVE-2018-17182, DLA-1529-1, DLA-1531-1, DSA-4308-1, FEDORA-2018-d77cc41f35, FEDORA-2018-e820fccd83, openSUSE-SU-2018:3071-1, openSUSE-SU-2018:3202-1, RHSA-2018:3656-01, SSA:2018-264-01, SSB-439005, SUSE-SU-2018:3032-1, SUSE-SU-2018:3083-1, SUSE-SU-2018:3084-1, SUSE-SU-2018:3100-1, SUSE-SU-2018:3159-1, SUSE-SU-2018:3659-1, SUSE-SU-2019:0095-1, USN-3776-1, USN-3776-2, USN-3777-1, USN-3777-2, USN-3777-3, VIGILANCE-VUL-27257.

Description of the vulnerability 

A local attacker can read a memory fragment via vmacache_flush_all() of the Linux kernel, in order to obtain sensitive information.
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This security weakness impacts software or systems such as Debian, Fedora, Android OS, Linux, openSUSE Leap, RHEL, SIMATIC, Slackware, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Synology DS***, Synology RS***, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 4.18.9.
The version 4.18.9 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.71.
The version 4.14.71 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.128.
The version 4.9.128 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.157.
The version 4.4.157 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.18.123.
The version 3.18.123 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: version 3.16.58.
The version 3.16.58 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

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

Debian 8: new linux-4.9 packages.
New packages are available:
  Debian 8: linux-4.9 4.9.110-3+deb9u5~deb8u1

Debian 8: new linux packages (05/10/2018).
New packages are available:
  Debian 8: linux 3.16.59-1

Debian 9: new linux packages.
New packages are available:
  Debian 9: linux 4.9.110-3+deb9u5

Fedora: new kernel-headers packages.
New packages are available:
  Fedora 27: kernel-headers 4.18.9-100.fc27
  Fedora 28: kernel-headers 4.18.9-200.fc28

Google Android/Pixel: patch for January 2019.
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-lp150.12.19.2

openSUSE Leap 42.3: new kernel packages.
New packages are available:
  openSUSE Leap 42.3: kernel 4.4.159-73.1

RHEL 7: new kernel-alt packages.
New packages are available:
  RHEL 7: kernel-alt 4.14.0-115.2.2.el7a

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

Slackware: new kernel packages.
New packages are available:
  Slackware 14.2: kernel 4.4.157-*-1

SUSE LE 11 SP4: new kernel packages.
New packages are available:
  SUSE LE 11 SP4: kernel 3.0.101-108.77.1

SUSE LE 12 RTM: new kernel packages.
New packages are available:
  SUSE LE 12 RTM: kernel default-3.12.61-52.146.1

SUSE LE 12 SP1: new kernel packages.
New packages are available:
  SUSE LE 12 SP1: kernel 3.12.74-60.64.107.1

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.95.1

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-rt packages (08/11/2018).
New packages are available:
  SUSE LE 12 SP3: kernel-rt 4.4.162-3.26.1

SUSE LE 15: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-25.22.1

Synology DSM: version 6.2.2-24922.
The version 6.2.2-24922 is fixed.

Synology DS/RS: version 6.2.2-24922.
The version 6.2.2-24922 is fixed:
  https://www.synology.com/

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.36.59
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.36.38

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 14.04 LTS: linux-image-generic-lts-xenial 4.4.0.137.117
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.137.143

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

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