Description
Unlike 32-bit PV guests, HVM guests may switch freely between 64-bit and other modes. This in particular means that they may set registers used to pass 32-bit-mode hypercall arguments to values outside of the range 32-bit code would be able to set them to. When processing of hypercalls takes a considerable amount of time, the hypervisor may choose to invoke a hypercall continuation. Doing so involves putting (perhaps updated) hypercall arguments in respective registers. For guests not running in 64-bit mode this further involves a certain amount of translation of the values. Unfortunately internal sanity checking of these translated values assumes high halves of registers to always be clear when invoking a hypercall. When this is found not to be the case, it triggers a consistency check in the hypervisor and causes a crash.
INFO
Published Date :
2024-05-16T13:39:26.183Z
Last Modified :
2025-11-04T17:12:51.532Z
Source :
XEN
AFFECTED PRODUCTS
The following products are affected by CVE-2023-46842 vulnerability.
| Vendors | Products |
|---|---|
| Fedoraproject |
|
| Xen |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2023-46842.
