CVE-2026-10046

Bitdefender Napoca bare-metal hypervisor contains an out-of-bounds write vulnerability in the BIOS INT 0x15 / E820 memory map handler, implemented in napoca/guests/bios_handlers.c. The handler computes a destination offset into the guest RealModeMemory buffer from guest-controlled ES and EDI register values without validating that the resulting address remains within the 1MB RealModeMemory allocation. A malicious guest operating in real mode can trigger the issue by invoking INT 0x15 with AX=0xE820, EDX=0x534D4150, ECX greater than or equal to 20, EBX=0, ES=0xFFFF, and EDI=0xFFFF. This can cause a write of up to 20 bytes past the end of the RealModeMemory buffer into the hypervisor heap. The product is end-of-life and unsupported when assigned.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://www.bitdefender.com/consumer/support/security-advisories/out-of-bounds-write-in-napoca-bios-int-0x15-e820-memory-map-handler-va-13905	Broken Link

Configurations

Configuration 1 (hide)

cpe:2.3:a:bitdefender:napoca:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-06-02 16:16

Updated : 2026-07-22 19:10

NVD link : CVE-2026-10046

Mitre link : CVE-2026-10046

CVE.ORG link : CVE-2026-10046

JSON object : View

Products Affected

bitdefender

napoca

CWE

CWE-787

Out-of-bounds Write

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The handler computes a destination offset into the guest RealModeMemory buffer from guest-controlled ES and EDI register values without validating that the resulting address remains within the 1MB RealModeMemory allocation. A malicious guest operating in real mode can trigger the issue by invoking INT 0x15 with AX=0xE820, EDX=0x534D4150, ECX greater than or equal to 20, EBX=0, ES=0xFFFF, and EDI=0xFFFF. This can cause a write of up to 20 bytes past the end of the RealModeMemory buffer into the hypervisor heap. The product is end-of-life and unsupported when assigned."}, {"lang": "es", "value": "El hipervisor bare-metal Bitdefender Napoca contiene una vulnerabilidad de escritura fuera de l\u00edmites en el gestor del mapa de memoria BIOS INT 0x15 / E820, implementado en napoca/guests/bios_handlers.c. El gestor calcula un desplazamiento de destino en el b\u00fafer RealModeMemory del invitado a partir de los valores de los registros ES y EDI controlados por el invitado sin validar que la direcci\u00f3n resultante permanezca dentro de la asignaci\u00f3n de 1MB de RealModeMemory. Un invitado malicioso que opera en modo real puede desencadenar el problema invocando INT 0x15 con AX=0xE820, EDX=0x534D4150, ECX mayor o igual a 20, EBX=0, ES=0xFFFF, y EDI=0xFFFF. Esto puede causar una escritura de hasta 20 bytes m\u00e1s all\u00e1 del final del b\u00fafer RealModeMemory en el heap del hipervisor. 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