RHSA-2021:1125: Red Hat Security Advisory: virt:8.3 and virt-devel:8.3 security and bug fix update

An update for the virt:8.3 and virt-devel:8.3 modules is now available for Advanced Virtualization for RHEL 8.3.1. Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.The Advanced Virtualization module provides the user-space component for running virtual machines that use KVM in environments managed by Red Hat products. Security Fix(es):

• qemu: out-of-bound heap buffer access via an interrupt ID field (CVE-2021-20221) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Bug Fix(es):
• Libvirt shouldn’t set the MTU of an unmanaged tap/macvtap device, it should just pass the mtu to the guest (BZ#1924681)
• libvirtd crashes in virEventThreadWorker (BZ#1942010) Related CVEs:
• CVE-2021-20221: qemu: out-of-bound heap buffer access via an interrupt ID field