Out-of-bounds write in Napoca BIOS INT 0x15 E820 memory map handler (VA-13905)_CVE-2026-10046

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-06-02T14:16:21.927Z",
    "modified": "2026-06-02T14:16:21.927Z",
    "type": "cve",
    "title": "Out-of-bounds write in Napoca BIOS INT 0x15 E820 memory map handler (VA-13905)",
    "source": "Bitdefender",
    "references": "https://www.bitdefender.com/consumer/support/security-advisories/out-of-bounds-write-in-napoca-bios-int-0x15-e820-memory-map-handler-va-13905",
    "id": "CVE-2026-10046",
    "bulletinFamily": "",
    "cwe": [
        "CWE-787"
    ],
    "cvelist": null,
    "sourceData": "Bitdefender Napoca bare-metal hypervisor all",
    "sourceHref": "",
    "cvss": {
        "score": 8.5,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Napoca bare-metal hypervisor",
    "version": "all",
    "vendor": "Bitdefender",
    "ai_description": "Out-of-bounds write vulnerability in the BIOS INT 0x15 / E820 memory map handler",
    "ai_severity": "High",
    "ai_vendor": "Bitdefender",
    "ai_product": "Napoca bare-metal hypervisor",
    "ai_version": "all",
    "ai_score": 8.5
}