The Vigil@nce team watches public vulnerabilities impacting your computers, and then offers security solutions, a vigilance database and tools to fix them.

Vulnerability of Linux kernel: use after free via vt_do_kdgkb_ioctl

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via vt_do_kdgkb_ioctl() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Impacted systems: Debian, Fedora, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this alert: 2/4.
Creation date: 16/10/2020.
Références of this alert: 1177766, CERTFR-2020-AVI-741, CERTFR-2020-AVI-750, CERTFR-2020-AVI-764, CERTFR-2020-AVI-769, CERTFR-2020-AVI-776, CERTFR-2020-AVI-784, CERTFR-2020-AVI-834, CERTFR-2021-AVI-006, CVE-2020-25656, DLA-2483-1, DLA-2494-1, FEDORA-2020-98ccae320c, FEDORA-2020-e211716d08, openSUSE-SU-2020:1906-1, openSUSE-SU-2020:2112-1, SUSE-SU-2020:3272-1, SUSE-SU-2020:3273-1, SUSE-SU-2020:3281-1, SUSE-SU-2020:3326-1, SUSE-SU-2020:3484-1, SUSE-SU-2020:3491-1, SUSE-SU-2020:3501-1, SUSE-SU-2020:3503-1, SUSE-SU-2020:3512-1, SUSE-SU-2020:3513-1, SUSE-SU-2020:3522-1, SUSE-SU-2020:3532-1, SUSE-SU-2020:3544-1, USN-4679-1, USN-4680-1, USN-4681-1, VIGILANCE-VUL-33611.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via vt_do_kdgkb_ioctl() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Full bulletin, software filtering, emails, fixes, ... (Request your free trial)

This cybersecurity announce impacts software or systems such as Debian, Fedora, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this computer weakness alert.

Solutions for this threat 

Linux kernel: patch for vt_do_kdgkb_ioctl.
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

Fedora 32-33: new kernel-headers packages.
New packages are available:
  Fedora 32: kernel-headers 5.9.7-100.fc32
  Fedora 33: kernel-headers 5.9.7-200.fc33

Fedora 32-33: new kernel packages.
New packages are available:
  Fedora 32: kernel 5.9.8-100.fc32
  Fedora 33: kernel 5.9.8-200.fc33

Fedora 32-33: new kernel-tools packages.
New packages are available:
  Fedora 32: kernel-tools 5.9.7-100.fc32
  Fedora 33: kernel-tools 5.9.7-200.fc33

openSUSE Leap 15.2: new kernel packages (13/11/2020).
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.50.1

openSUSE Leap 15.2: new kernel packages (30/11/2020).
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.50.1.lp152.8.10.1

SUSE LE 12 SP2: new kernel-default packages.
New packages are available:
  SUSE LE 12 SP2: kernel-default 4.4.121-92.146.1
  SUSE LE 12 SP2: kernel-default 4.4.121-92.146.1

SUSE LE 12 SP3: new kernel-default packages.
New packages are available:
  SUSE LE 12 SP3: kernel-default 4.4.180-94.135.1

SUSE LE 12 SP4: new kernel-default packages.
New packages are available:
  SUSE LE 12 SP4: kernel-default 4.12.14-95.65.1

SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.34.1

SUSE LE 12 SP5: new kernel packages (16/11/2020).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.51.2

SUSE LE 12 SP5: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.22.1

SUSE LE 15: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel-default-livepatch 4.12.14-150.63.1, kernel-livepatch 4_12_14-150_63-default-1-1.5.1

SUSE LE 15 SP1: new kernel-azure packages (24/11/2020).
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.52.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.67.1

SUSE LE 15 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.41.2

SUSE LE 15 SP2: new kernel-azure packages (24/11/2020).
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.24.1

SUSE LE 15 SP2: new kernel packages.
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.37.1

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: 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
Full bulletin, software filtering, emails, fixes, ... (Request your free trial)

Computer vulnerabilities tracking service 

Vigil@nce provides a systems vulnerabilities note. The Vigil@nce computer vulnerability tracking service alerts your teams of vulnerabilities or threats impacting your information system.