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Vulnerability of Linux kernel: buffer overflow via vgacon_scrollback_update

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via vgacon_scrollback_update() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable products: Debian, Linux, openSUSE Leap, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES.
Severity of this weakness: 2/4.
Creation date: 28/07/2020.
Références of this bulletin: CERTFR-2020-AVI-483, CERTFR-2020-AVI-547, CERTFR-2020-AVI-548, CERTFR-2020-AVI-553, CERTFR-2020-AVI-568, CERTFR-2020-AVI-574, CERTFR-2020-AVI-614, CERTFR-2020-AVI-655, CERTFR-2020-AVI-699, CERTFR-2020-AVI-724, CERTFR-2020-AVI-742, CVE-2020-14331, DLA-2385-1, DLA-2420-1, DLA-2420-2, openSUSE-SU-2020:1153-1, openSUSE-SU-2020:1236-1, openSUSE-SU-2020:1325-1, RHSA-2020:4286-01, RHSA-2020:4289-01, RHSA-2020:5023-01, RHSA-2020:5026-01, SSA:2020-295-01, SUSE-SU-2020:2102-1, SUSE-SU-2020:2119-1, SUSE-SU-2020:2122-1, SUSE-SU-2020:2485-1, SUSE-SU-2020:2486-1, SUSE-SU-2020:2540-1, SUSE-SU-2020:2541-1, SUSE-SU-2020:2574-1, SUSE-SU-2020:2575-1, SUSE-SU-2020:2576-1, SUSE-SU-2020:2582-1, SUSE-SU-2020:2605-1, SUSE-SU-2020:2610-1, SUSE-SU-2020:2623-1, SUSE-SU-2020:2631-1, VIGILANCE-VUL-32928.

Description of the vulnerability 

An attacker can trigger a buffer overflow via vgacon_scrollback_update() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This weakness impacts software or systems such as Debian, Linux, openSUSE Leap, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES.

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

Solutions for this threat 

Linux kernel: version 5.8.1.
The version 5.8.1 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.7.15.
The version 5.7.15 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.58.
The version 5.4.58 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.139.
The version 4.19.139 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.194.
The version 4.14.194 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.233.
The version 4.9.233 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.233.
The version 4.4.233 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for vgacon_scrollback_update.
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 15.1: new kernel packages (03/09/2020).
New packages are available:
  openSUSE Leap 15.1: kernel debug-4.12.14-lp151.28.63.1

openSUSE Leap 15.1: new kernel packages (07/08/2020).
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.59.1

openSUSE Leap 15.2: new kernel packages.
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.36.1

RHEL 7: new kernel packages.
New packages are available:
  RHEL 7.0-7.9: kernel 3.10.0-1160.6.1.el7

RHEL 7: new kernel-rt packages.
New packages are available:
  RHEL 7.0-7.9: kernel-rt 3.10.0-1160.6.1.rt56.1139.el7

RHEL 8.2: new kernel packages.
New packages are available:
  RHEL 8.2: kernel 4.18.0-193.28.1.el8_2

RHEL 8.2: new kernel-rt packages.
New packages are available:
  RHEL 8.2: kernel-rt 4.18.0-193.28.1.rt13.77.el8_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 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.141.1

SUSE LE 12 SP3: new kernel packages.
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.180-94.130.1

SUSE LE 12 SP4: new kernel packages.
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.60.1

SUSE LE 12 SP5: new kernel-azure packages (05/08/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.22.1

SUSE LE 12 SP5: new kernel-azure packages (07/09/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.25.1

SUSE LE 12 SP5: new kernel packages (05/08/2020).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.29.1

SUSE LE 12 SP5: new kernel packages (08/09/2020).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.37.1

SUSE LE 12 SP5: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.16.1

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.58.1

SUSE LE 15 SP1: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.41.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.56.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.31.1

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.12.1

SUSE LE 15 SP2: new kernel packages.
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.12.1
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