Xen is vulnerable to denial of service. Unprivileged guest users are able to obtain and modify permissions, list and delete root nodes. This is due to permissions that are not properly enforced.
lists.fedoraproject.org/archives/list/[email protected]/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/
lists.fedoraproject.org/archives/list/[email protected]/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI/
secdb.alpinelinux.org/v3.12/main.yaml
security.gentoo.org/glsa/202107-30
www.debian.org/security/2020/dsa-4812
xenbits.xenproject.org/xsa/advisory-353.html