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CVE-2026-10047— Out-of-bounds write in Napoca real-mode hook handler via guest-controlled SS:SP (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，该漏洞源于实模式钩子处理程序中越界写入，可能导致IRET帧推送写入超出RealModeMemory缓冲区末尾65,519字节到虚拟机管理程序堆中。

AI Predicted 7.8 Difficulty: Hard EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
Bitdefender Napoca bare-metal hypervisor all affected
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I. Basic Information for CVE-2026-10047

Vulnerability Information
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Vulnerability Title
Out-of-bounds write in Napoca real-mode hook handler via guest-controlled SS:SP (VA-13905)
Source: CVE Program / CVE List V5
Vulnerability Description
The Bitdefender Napoca bare-metal hypervisor contains an out-of-bounds write vulnerability in the real-mode hook handler, implemented in napoca/kernel/handler.c. The handler uses a guest-controlled SS:SP-derived offset as an index into the 1MB RealModeMemory buffer without bounds validation. With SS=0xFFFF and ESP=0xFFFF, the computed offset can reach 0x10FFEF, exceeding the RealModeMemory buffer by 65,519 bytes. The IRET frame push can therefore write past the end of the 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，该漏洞源于实模式钩子处理程序中越界写入，可能导致IRET帧推送写入超出RealModeMemory缓冲区末尾65,519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-2026-10047

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III. Intelligence Information for CVE-2026-10047

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Vendor Advisories for CVE-2026-10047 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-10047

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