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

Quick assessment

Affected
Bitdefender Napoca bare-metal hypervisor
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Bitdefender Napoca是Bitdefender开源的一个轻量级Type-1裸机虚拟机监控器。 Bitdefender Napoca存在缓冲区错误漏洞，该漏洞源于BIOS INT 0x15 / E820内存映射处理程序中越界写入，可能导致恶意客户机在实模式下触发写入超出RealModeMemory缓冲区末尾最多20字节到虚拟机管理程序堆中。

AI Predicted 6.8 Difficulty: Hard EPSS 0.12% · P2

Affected Version Matrix 1

VendorProduct Version RangeStatus
Bitdefender Napoca bare-metal hypervisor all affected
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I. Basic Information for CVE-2026-10046

Vulnerability Information
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Vulnerability Title
Out-of-bounds write in Napoca BIOS INT 0x15 E820 memory map handler (VA-13905)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Bitdefender Napoca 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bitdefender Napoca是Bitdefender开源的一个轻量级Type-1裸机虚拟机监控器。 Bitdefender Napoca存在缓冲区错误漏洞，该漏洞源于BIOS INT 0x15 / E820内存映射处理程序中越界写入，可能导致恶意客户机在实模式下触发写入超出RealModeMemory缓冲区末尾最多20字节到虚拟机管理程序堆中。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Bitdefender Napoca bare-metal hypervisor all -

II. Public POCs for CVE-2026-10046

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III. Intelligence Information for CVE-2026-10046

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Vendor Advisories for CVE-2026-10046 (1)

IV. Related Vulnerabilities

Same product: Napoca bare-metal hypervisor
Same vendor: Bitdefender
Same weakness: CWE-787

V. Comments for CVE-2026-10046

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