CVE-2023-46842 — MEDIUM (6.5)

Vulnerability 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 Score

6.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Xen	Xen	>= 3.2.0
Fedoraproject	Fedora	38

Related Weaknesses (CWE)

CWE-843

References

https://xenbits.xenproject.org/xsa/advisory-454.htmlPatchVendor Advisory
http://xenbits.xen.org/xsa/advisory-454.htmlPatchVendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]Mailing ListThird Party Advisory
https://xenbits.xenproject.org/xsa/advisory-454.htmlPatchVendor Advisory

FAQ

What is CVE-2023-46842?

CVE-2023-46842 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 outsi...

How severe is CVE-2023-46842?

CVE-2023-46842 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2023-46842?

Check the references section above for vendor advisories and patch information. Affected products include: Xen Xen, Fedoraproject Fedora.