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Vulnerability of Linux kernel: out-of-bounds memory reading via ppp_cp_parse_cr

Synthesis of the vulnerability 

An attacker can force a read at an invalid address via ppp_cp_parse_cr() of the Linux kernel, in order to trigger a denial of service, or to obtain sensitive information.
Impacted systems: Debian, Linux, openSUSE Leap, Slackware, SUSE Linux Enterprise Desktop, SLES.
Severity of this alert: 1/4.
Creation date: 07/10/2020.
Références of this alert: CERTFR-2020-AVI-642, CERTFR-2020-AVI-654, CERTFR-2020-AVI-668, CVE-2020-25643, DSA-4774-1, openSUSE-SU-2020:1655-1, openSUSE-SU-2020:1698-1, RHBUG-1879981, SSA:2020-295-01, SUSE-SU-2020:2904-1, SUSE-SU-2020:2905-1, SUSE-SU-2020:2906-1, SUSE-SU-2020:2907-1, SUSE-SU-2020:2980-1, SUSE-SU-2020:2999-1, SUSE-SU-2020:3014-1, VIGILANCE-VUL-33497.

Description of the vulnerability 

An attacker can force a read at an invalid address via ppp_cp_parse_cr() of the Linux kernel, in order to trigger a denial of service, or to obtain sensitive information.
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This cybersecurity alert impacts software or systems such as Debian, Linux, openSUSE Leap, Slackware, SUSE Linux Enterprise Desktop, SLES.

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

Solutions for this threat 

Linux kernel: version 5.8.12.
The version 5.8.12 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.68.
The version 5.4.68 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.148.
The version 4.19.148 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.200.
The version 4.14.200 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.238.
The version 4.9.238 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.238.
The version 4.4.238 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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

Debian 10: new linux packages.
New packages are available:
  Debian 10: linux 4.19.152-1

openSUSE Leap 15.1: new kernel packages (12/10/2020).
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.71.1

openSUSE Leap 15.2: new kernel packages (20/10/2020).
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.47.2

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 SP5: new kernel packages (13/10/2020).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.41.1

SUSE LE 12 SP5: new kerne-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.19.1

SUSE LE 15 SP1: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.47.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.61.1

SUSE LE 15 SP1: new kernel-rt packages (23/10/2020).
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.36.1

SUSE LE 15 SP2: new kernel packages.
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.29.2
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