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

Synthesis of the vulnerability 

An attacker can force a read at an invalid address via fbcon_copy_font() of the Linux kernel, in order to trigger a denial of service, or to obtain sensitive information.
Vulnerable systems: Debian, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 2/4.
Creation date: 09/11/2020.
Références of this weakness: CERTFR-2020-AVI-776, CERTFR-2020-AVI-794, CERTFR-2020-AVI-811, CERTFR-2020-AVI-834, CERTFR-2020-AVI-837, CERTFR-2021-AVI-006, CERTFR-2021-AVI-012, CERTFR-2021-AVI-111, CERTFR-2021-AVI-120, CERTFR-2021-AVI-125, CERTFR-2021-AVI-149, CVE-2020-28974, DLA-2483-1, DLA-2494-1, openSUSE-SU-2020:2161-1, openSUSE-SU-2020:2193-1, openSUSE-SU-2020:2260-1, openSUSE-SU-2021:0242-1, SUSE-SU-2020:3522-1, SUSE-SU-2020:3713-1, SUSE-SU-2020:3714-1, SUSE-SU-2020:3715-1, SUSE-SU-2020:3717-1, SUSE-SU-2020:3718-1, SUSE-SU-2020:3748-1, SUSE-SU-2020:3766-1, SUSE-SU-2020:3798-1, SUSE-SU-2021:0434-1, SUSE-SU-2021:0437-1, SUSE-SU-2021:0438-1, SUSE-SU-2021:0452-1, SUSE-SU-2021:14630-1, USN-4679-1, USN-4680-1, USN-4681-1, USN-4683-1, USN-4751-1, VIGILANCE-VUL-33854.

Description of the vulnerability 

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

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

Solutions for this threat 

Linux kernel: version 5.9.7.
The version 5.9.7 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.76.
The version 5.4.76 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.156.
The version 4.19.156 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.205.
The version 4.14.205 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.242.
The version 4.9.242 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.242.
The version 4.4.242 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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

Debian 9: new linux-4.19 packages (10/12/2020).
New packages are available:
  Debian 9: linux-4.19 4.19.160-2~deb9u1

Debian 9: new linux packages.
New packages are available:
  Debian 9: linux 4.9.246-2

openSUSE Leap 15.1: new kernel packages (07/12/2020).
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.87.1

openSUSE Leap 15.2: new kernel packages (07/12/2020).
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.54.1

openSUSE Leap 15.2: new kernel packages (15/12/2020).
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.57.1.lp152.8.17.1

openSUSE Leap 15.2: new kernel-rt packages.
New packages are available:
  openSUSE Leap 15.2: kernel-rt 5.3.18-lp152.3.5.1

SUSE LE 11 SP4: new kernel packages.
New packages are available:
  SUSE LE 11 SP4: kernel 3.0.101-108.120.1

SUSE LE 12 SP2: new kernel packages (11/02/2021).
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.149.1

SUSE LE 12 SP3: new kernel packages (15/02/2021).
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.180-94.138.1

SUSE LE 12 SP4: new kernel packages.
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.68.1

SUSE LE 12 SP5: new kernel-azure packages (09/12/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.38.1

SUSE LE 12 SP5: new kernel packages (09/12/2020).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.54.1

SUSE LE 12 SP5: new kernel-rt packages (14/12/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.25.1

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.66.1

SUSE LE 15 SP1: new kernel-azure packages (09/12/2020).
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.55.1

SUSE LE 15 SP1: new kernel packages (09/12/2020).
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.75.1

SUSE LE 15 SP1: new kernel-rt packages (15/12/2020).
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.44.2

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.29.1

SUSE LE 15 SP2: new kernel packages (11/12/2020).
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.43.2

SUSE LE 15 SP2: new kernel-rt packages (26/11/2020).
New packages are available:
  SUSE LE 15 SP2: kernel-rt 5.3.18-16.1

Ubuntu 20.04: new linux-image-oem-20.04 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-oem-20.04 5.6.0.1039.37

Ubuntu 20: new linux-image-5.8.0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-generic-hwe-20.04 5.8.0.44.50~20.04.30
  Ubuntu 20.10: linux-image-generic 5.8.0.44.49

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1103.78
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.129.128
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.129.116

Ubuntu: new linux-image-4.4.0 packages (06/01/2021).
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.198.173
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.198.204

Ubuntu: new linux-image-5.4.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.4.0.59.65~18.04.54
  Ubuntu 20.04 LTS: linux-image-generic 5.4.0.59.62
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