CVE-2020-11741

An issue was discovered in xenoprof in Xen through 4.13.x, allowing guest
OS users (with active profiling) to obtain sensitive information about
other guests, cause a denial of service, or possibly gain privileges. For
guests for which “active” profiling was enabled by the administrator, the
xenoprof code uses the standard Xen shared ring structure. Unfortunately,
this code did not treat the guest as a potential adversary: it trusts the
guest not to modify buffer size information or modify head / tail pointers
in unexpected ways. This can crash the host (DoS). Privilege escalation
cannot be ruled out.

Notes