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Vulnerability of Linux kernel: NULL pointer dereference via spk_ttyio_receive_buf2

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via spk_ttyio_receive_buf2() of the Linux kernel, in order to trigger a denial of service.
Impacted products: Linux, openSUSE Leap, SLES.
Severity of this bulletin: 1/4.
Creation date: 07/12/2020.
Références of this threat: CERTFR-2021-AVI-021, CERTFR-2021-AVI-035, CVE-2020-27830, SUSE-SU-2021:0096-1, SUSE-SU-2021:0108-1, SUSE-SU-2021:0117-1, VIGILANCE-VUL-34041.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via spk_ttyio_receive_buf2() of the Linux kernel, in order to trigger a denial of service.
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This threat impacts software or systems such as Linux, openSUSE Leap, SLES.

Our Vigil@nce team determined that the severity of this computer threat 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 cybersecurity bulletin.

Solutions for this threat 

Linux kernel: version 5.9.14.
The version 5.9.14 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.83.
The version 5.4.83 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.163.
The version 4.19.163 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.212.
The version 4.14.212 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for spk_ttyio_receive_buf2.
A patch is indicated in information sources.

openSUSE Leap 15.2: new kernel packages (15/01/2021).
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.60.1

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.32.1

SUSE LE 15 SP2: new kernel packages (14/01/2021).
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.46.1

SUSE LE 15 SP2: new kernel-rt packages (13/01/2021).
New packages are available:
  SUSE LE 15 SP2: kernel-rt 5.3.18-22.1
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