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Vulnerability of Linux kernel: overload via KVM Ioapic Lazy EOI

Synthesis of the vulnerability 

An attacker can trigger an overload via KVM Ioapic Lazy EOI of the Linux kernel, in order to trigger a denial of service.
Vulnerable software: Linux, RHEL, Ubuntu.
Severity of this announce: 1/4.
Creation date: 29/10/2020.
Références of this computer vulnerability: CERTFR-2020-AVI-786, CERTFR-2021-AVI-149, CERTFR-2021-AVI-242, CVE-2020-27152, RHSA-2021:1081-01, RHSA-2021:1093-01, USN-4659-1, USN-4659-2, USN-4752-1, VIGILANCE-VUL-33733.

Description of the vulnerability 

An attacker can trigger an overload via KVM Ioapic Lazy EOI 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, RHEL, Ubuntu.

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 5.9.2.
The version 5.9.2 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.8.17.
The version 5.8.17 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: patch for KVM Ioapic Lazy EOI.
A patch is indicated in information sources.

RHEL 8.3: new kernel packages.
New packages are available:
  RHEL 8.3: kernel 4.18.0-240.22.1.el8_3

RHEL 8.3: new kernel-rt packages.
New packages are available:
  RHEL 8.3: kernel-rt 4.18.0-240.22.1.rt7.77.el8_3

Ubuntu 20.04: new linux-image-5.6.0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-oem-20.04 5.6.0.1048.44

Ubuntu 20.10: new linux-image-5.8.0 packages.
New packages are available:
  Ubuntu 20.10: linux-image-generic 5.8.0.33.38
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Computer vulnerabilities tracking service 

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