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Vulnerability of Linux kernel: memory leak via kvm_io_bus_unregister_dev

Synthesis of the vulnerability 

An attacker can create a memory leak via kvm_io_bus_unregister_dev() of the Linux kernel, in order to trigger a denial of service.
Vulnerable software: Linux, openSUSE Leap, SLES.
Severity of this announce: 1/4.
Creation date: 16/04/2021.
Références of this computer vulnerability: CERTFR-2021-AVI-278, CERTFR-2021-AVI-284, CERTFR-2021-AVI-302, CVE-2020-36312, openSUSE-SU-2021:0579-1, SUSE-SU-2021:1211-1, SUSE-SU-2021:1238-1, SUSE-SU-2021:1301-1, VIGILANCE-VUL-35095.

Description of the vulnerability 

An attacker can create a memory leak via kvm_io_bus_unregister_dev() of the Linux kernel, in order to trigger a denial of service.
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This computer threat bulletin impacts software or systems such as Linux, openSUSE Leap, SLES.

Our Vigil@nce team determined that the severity of this security 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 computer vulnerability alert.

Solutions for this threat 

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

openSUSE Leap 15.2: new kernel packages.
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.72.1

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.44.1

SUSE LE 15 SP2: new kernel packages.
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.61.1

SUSE LE 15 SP2: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP2: kernel-rt 5.3.18-33.1
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