CVE-2022-42334

x86/HVM pinned cache attributes mis-handling T[his CNA information record
relates to multiple CVEs; the text explains which aspects/vulnerabilities
correspond to which CVE.] To allow cachability control for HVM guests with
passed through devices, an interface exists to explicitly override defaults
which would otherwise be put in place. While not exposed to the affected
guests themselves, the interface specifically exists for domains
controlling such guests. This interface may therefore be used by not fully
privileged entities, e.g. qemu running deprivileged in Dom0 or qemu running
in a so called stub-domain. With this exposure it is an issue that - the
number of the such controlled regions was unbounded (CVE-2022-42333), -
installation and removal of such regions was not properly serialized
(CVE-2022-42334).

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1033297&gt;

Notes