CVE-2023-46842

CVE-2023-46842 · x86 HVM hypercalls may trigger Xen bug check

Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.

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.

CVSS 6.5 · Moyenne · EPSS 8,5% · Correctif disponible

Publication

2024-05-16T13:39:26.183Z

Mise à jour

2025-11-04T17:12:51.532Z

Pile logicielle: system

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