xen is vulnerable to denial of service. A guest OS user is able to crash the host OS due to incorrect error handling in an event-channel port allocation.
lists.opensuse.org/opensuse-security-announce/2020-07/msg00024.html
lists.opensuse.org/opensuse-security-announce/2020-07/msg00031.html
www.openwall.com/lists/oss-security/2020/07/07/2
xenbits.xen.org/xsa/advisory-317.html
lists.fedoraproject.org/archives/list/[email protected]/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/
lists.fedoraproject.org/archives/list/[email protected]/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/
security.gentoo.org/glsa/202007-02
www.debian.org/security/2020/dsa-4723