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Vulnerability of Linux kernel: information disclosure via fill_thread_core_info

Synthesis of the vulnerability 

A local attacker can read a memory fragment via fill_thread_core_info() of the Linux kernel, in order to obtain sensitive information.
Vulnerable products: Debian, Linux, openSUSE Leap, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this weakness: 1/4.
Creation date: 06/05/2020.
Références of this bulletin: CERTFR-2020-AVI-368, CERTFR-2020-AVI-376, CERTFR-2020-AVI-421, CERTFR-2020-AVI-460, CERTFR-2020-AVI-462, CERTFR-2020-AVI-466, CERTFR-2020-AVI-483, CERTFR-2020-AVI-489, CERTFR-2020-AVI-541, CERTFR-2020-AVI-547, CERTFR-2020-AVI-612, CVE-2020-10732, DLA-2242-1, DSA-4698-1, DSA-4699-1, openSUSE-SU-2020:0801-1, openSUSE-SU-2020:0935-1, RHSA-2020:4060-01, RHSA-2020:4062-01, SSA:2020-163-01, SUSE-SU-2020:14442-1, SUSE-SU-2020:1599-1, SUSE-SU-2020:1663-1, SUSE-SU-2020:2027-1, SUSE-SU-2020:2105-1, SUSE-SU-2020:2134-1, SUSE-SU-2020:2152-1, SUSE-SU-2020:2156-1, SUSE-SU-2020:2478-1, SUSE-SU-2020:2487-1, USN-4411-1, USN-4427-1, USN-4439-1, USN-4440-1, USN-4485-1, VIGILANCE-VUL-32184.

Description of the vulnerability 

A local attacker can read a memory fragment via fill_thread_core_info() of the Linux kernel, in order to obtain sensitive information.
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This cybersecurity vulnerability impacts software or systems such as Debian, Linux, openSUSE Leap, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 5.6.16.
The version 5.6.16 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.44.
The version 5.4.44 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.126.
The version 4.19.126 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.183.
The version 4.14.183 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.226.
The version 4.9.226 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.226.
The version 4.4.226 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.16.85.
The version 3.16.85 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

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

Debian 10: new linux packages.
New packages are available:
  Debian 10: linux 4.19.118-2+deb10u1

Debian 8: new linux-4.9 packages.
New packages are available:
  Debian 8: linux-4.9 4.9.210-1+deb9u1~deb8u1

Debian 9: new linux packages.
New packages are available:
  Debian 9: linux 4.9.210-1+deb9u1

openSUSE Leap 15.1: new kernel packages.
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.52.1

openSUSE Leap 15.2: new kernel packages.
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.20.7.1

RHEL 7.8: new kernel packages.
New packages are available:
  RHEL 7.0-7.8: kernel 3.10.0-1160.el7

RHEL 7.8: new kernel-rt packages.
New packages are available:
  RHEL 7.0-7.8: kernel-rt 3.10.0-1160.rt56.1131.el7

Slackware 14.2: new kernel packages.
New packages are available:
  Slackware 14.2: kernel 4.4.227-i586-1

SUSE LE 11 SP4: new kernel packages (04/08/2020).
New packages are available:
  SUSE LE 11 SP4: kernel 3.0.101-108.117.1

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.138.1

SUSE LE 12 SP3: new kernel packages.
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.180-94.127.1

SUSE LE 12 SP4: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP4: kernel-rt 4.12.14-8.23.1

SUSE LE 12 SP5: new kernel-rt packages (03/09/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.13.1

SUSE LE 15: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.52.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.45.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.28.1

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.5.1

SUSE LE 15 SP2: new kernel packages.
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.9.1

Ubuntu 18.0: new linux-image-5.0.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gke-5.0 5.0.0.1045.30

Ubuntu 18.0: new linux-image-5.3.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-gcp 5.3.0.1032.26

Ubuntu 20.04: new linux-image-5.4.0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-generic 5.4.0.28.35

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1093.70
  Ubuntu 16.04 LTS: linux-image-gcp 4.15.0.1081.83
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.115.103

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.186.163
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.186.192
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