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Vulnerability of Linux kernel: memory corruption via KVM

Synthesis of the vulnerability 

An attacker can trigger a memory corruption via KVM of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable systems: Linux, RHEL, Ubuntu.
Severity of this threat: 1/4.
Creation date: 07/05/2021.
Références of this weakness: CERTFR-2021-AVI-424, CERTFR-2021-AVI-432, CERTFR-2021-AVI-436, CVE-2021-3501, RHSA-2021:2165-01, RHSA-2021:2168-01, RHSA-2021:2169-01, USN-4977-1, USN-4983-1, VIGILANCE-VUL-35276.

Description of the vulnerability 

An attacker can trigger a memory corruption via KVM of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This computer threat impacts software or systems such as Linux, RHEL, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 5.12.
The version 5.12 is fixed:
  https://www.kernel.org/

RHEL 8.4: new kernel packages.
New packages are available:
  RHEL 8.4: kernel 4.18.0-305.3.1.el8_4

RHEL 8.4: new kernel-rt packages.
New packages are available:
  RHEL 8.4: kernel-rt 4.18.0-305.3.1.rt7.75.el8_4

RHEL 8: new kpatch-patch packages.
New packages are available:
  RHEL 8.0-8.4: kpatch-patch 4_18_0-305-1-1.el8

Ubuntu 20.04: new linux-image-5.10.0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-oem-20.04 5.10.0.1029.30

Ubuntu 21.04: new linux-image-5.11.0 packages.
New packages are available:
  Ubuntu 21.04: linux-image-generic 5.11.0.18.19
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