{"schema_version":"1.7.5","id":"CVE-2021-27379","published":"2021-02-18T17:15:15.867Z","modified":"2026-03-15T22:39:57.065704Z","related":["SUSE-SU-2021:1250-1","SUSE-SU-2021:1251-1","SUSE-SU-2021:1252-1","SUSE-SU-2021:1268-1"],"details":"An issue was discovered in Xen through 4.11.x, allowing x86 Intel HVM guest OS users to achieve unintended read/write DMA access, and possibly cause a denial of service (host OS crash) or gain privileges. This occurs because a backport missed a flush, and thus IOMMU updates were not always correct. NOTE: this issue exists because of an incomplete fix for CVE-2020-15565.","affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-27379.json","unresolved_ranges":[{"events":[{"introduced":"3.2.0"},{"fixed":"4.12.0"}]},{"events":[{"introduced":"0"},{"last_affected":"10.0"}]}]}}],"references":[{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/02/23/1"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-4888"},{"type":"FIX","url":"http://xenbits.xen.org/xsa/advisory-366.html"},{"type":"FIX","url":"https://xenbits.xen.org/xsa/advisory-366.html"}],"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}