XEN Hypervisor vCPU Page-Table Switch Flaw Mapcache Corruption
CVE-2026-42488 Published on June 18, 2026

x86: mismatched mapcache metadata
Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

NVD

Vulnerability Analysis

CVE-2026-42488 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
NETWORK
Attack Complexity:
HIGH
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is a Buffer Overflow Vulnerability?

The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.

CVE-2026-42488 has been classified to as a Buffer Overflow vulnerability or weakness.


Products Associated with CVE-2026-42488

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Citrix Xen Xen
 

Affected Versions

Xen Version consult Xen advisory XSA-494 is unknown by CVE-2026-42488