CVE-2023-46842
When this is found not to be the case, it triggers a consistency check in the hypervisor and causes a crash.
Does this matter?
Lower severity and a low EPSS score (8.53%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- EPSS
- 8.53% probability · 95th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-843
- Affected
- xen/xen · fedoraproject/fedora
- Source
- security@xen.org
References
- https://xenbits.xenproject.org/xsa/advisory-454.htmlPatch, Vendor Advisory
- http://xenbits.xen.org/xsa/advisory-454.htmlPatch, Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/D5OK6MH75S7YWD34EWW7QIZTS627RIE3/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RYAZ7P6YFJ2E3FHKAGIKHWS46KYMMTZH/Mailing List, Third Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-454.htmlPatch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.