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debiancveDebian Security Bug TrackerDEBIANCVE:CVE-2021-28711
HistoryJan 05, 2022 - 5:15 p.m.

CVE-2021-28711

2022-01-0517:15:00
Debian Security Bug Tracker
security-tracker.debian.org
33

0.001 Low

EPSS

Percentile

27.1%

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