Xen is vulnerable denial of service (DoS). Both AMD and Intel allow ACPI tables to specify regions of memory which should be left untranslated, which typically means these addresses should pass the translation phase unaltered. While these are typically device specific ACPI properties, they can also be specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed to prevent guests from undoing/replacing such mappings.
www.openwall.com/lists/oss-security/2021/09/01/1
www.openwall.com/lists/oss-security/2021/09/01/5
www.openwall.com/lists/oss-security/2021/09/01/6
lists.fedoraproject.org/archives/list/[email protected]/message/2VQCFAPBNGBBAOMJZG6QBREOG5IIDZID/
lists.fedoraproject.org/archives/list/[email protected]/message/FZCNPSRPGFCQRYE2BI4D4Q4SCE56ANV2/
lists.fedoraproject.org/archives/list/[email protected]/message/LPRVHW4J4ZCPPOHZEWP5MOJT7XDGFFPJ/
secdb.alpinelinux.org/edge/main.yaml
secdb.alpinelinux.org/v3.13/main.yaml
secdb.alpinelinux.org/v3.14/main.yaml
security.gentoo.org/glsa/202208-23
www.debian.org/security/2021/dsa-4977
xenbits.xenproject.org/xsa/advisory-378.txt