CVE ID:	CVE-2021-28712
Description:	Rogue backends can cause DoS of guests via high frequency events T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen offers the ability to run PV backends in regular unprivileged guests, typically referred to as "driver domains". Running PV backends in driver domains has one primary security advantage: if a driver domain gets compromised, it doesn't have the privileges to take over the system. However, a malicious driver domain could try to attack other guests via sending events at a high frequency leading to a Denial of Service in the guest due to trying to service interrupts for elongated amounts of time. There are three affected backends: * blkfront patch 1, CVE-2021-28711 * netfront patch 2, CVE-2021-28712 * hvc_xen (console) patch 3, CVE-2021-28713
Test IDs:	1.3.6.1.4.1.25623.1.1.2.2022.2026   1.3.6.1.4.1.25623.1.1.2.2022.1607   1.3.6.1.4.1.25623.1.1.2.2022.1508   1.3.6.1.4.1.25623.1.1.2.2022.1429
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2021-28712 Debian Security Information: DSA-5050 (Google Search) https://www.debian.org/security/2022/dsa-5050 Debian Security Information: DSA-5096 (Google Search) https://www.debian.org/security/2022/dsa-5096 https://xenbits.xenproject.org/xsa/advisory-391.txt https://xenbits.xenproject.org/xsa/advisory-391.txt https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html