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CVE-2026-42486 is an authorization flaw in XAPI role-based access control affecting the VM.platform:hvm_serial parameter. A user with the lower-privileged vm-admin role can set VM.platform:hvm_serial even though that operation should be restricted to the fully privileged pool-admin role. The issue stems from inadequate per-key RBAC enforcement on VM.platform setters, allowing modification of a sensitive platform key through an API path that did not correctly apply the intended privilege boundary. Because the hvm_serial setting can be used to direct writes into the control domain, successful exploitation can result in arbitrary file write in dom0.
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Privilege/authorization weakness in XAPI RBAC allowing a vm-admin to set VM.platform:hvm_serial, which can enable arbitrary file write in dom0.
An improper privilege restriction in XAPI/XenServer where a vm-admin can set VM.platform:hvm_serial, enabling arbitrary file write in dom0.
Privilege/authorization weakness in XAPI RBAC allowing a vm-admin to set VM.platform:hvm_serial, which can enable arbitrary file write in dom0.
One of the confirmed actionable XAPI RBAC escalation vulnerabilities discussed in XSA-489/VSA-2026-011.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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