CVE-2026-10046: CWE-787: Out-of-bounds Write in Bitdefender Napoca bare-metal hypervisor
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.
AI Analysis
Technical Summary
The vulnerability in Bitdefender Napoca bare-metal hypervisor involves an out-of-bounds write in the BIOS INT 0x15 / E820 memory map handler implemented in napoca/guests/bios_handlers.c. The handler calculates a destination offset into the guest RealModeMemory buffer using ES and EDI register values controlled by the guest, without validating that the address remains within the 1MB RealModeMemory allocation. A malicious guest can trigger this by invoking INT 0x15 with specific register values (AX=0xE820, EDX=0x534D4150, ECX≥20, EBX=0, ES=0xFFFF, EDI=0xFFFF), causing a write of up to 20 bytes past the buffer end into the hypervisor heap. The product is end-of-life and unsupported, and no patch or remediation level has been provided.
Potential Impact
Successful exploitation allows a malicious guest operating system running in real mode to perform an out-of-bounds write beyond the allocated RealModeMemory buffer into the hypervisor heap. This could potentially lead to memory corruption within the hypervisor, which may affect hypervisor stability or security. However, there are no known exploits in the wild. The product is end-of-life and unsupported, so no official fixes are available.
Mitigation Recommendations
No official patch or remediation is available as the product is end-of-life and unsupported. Users should consider discontinuing use of the affected Bitdefender Napoca bare-metal hypervisor or migrating to a supported alternative. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance if available.
CVE-2026-10046: CWE-787: Out-of-bounds Write in Bitdefender Napoca bare-metal hypervisor
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.
CVSS v4.0
Score 8.5high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Bitdefender Napoca bare-metal hypervisor involves an out-of-bounds write in the BIOS INT 0x15 / E820 memory map handler implemented in napoca/guests/bios_handlers.c. The handler calculates a destination offset into the guest RealModeMemory buffer using ES and EDI register values controlled by the guest, without validating that the address remains within the 1MB RealModeMemory allocation. A malicious guest can trigger this by invoking INT 0x15 with specific register values (AX=0xE820, EDX=0x534D4150, ECX≥20, EBX=0, ES=0xFFFF, EDI=0xFFFF), causing a write of up to 20 bytes past the buffer end into the hypervisor heap. The product is end-of-life and unsupported, and no patch or remediation level has been provided.
Potential Impact
Successful exploitation allows a malicious guest operating system running in real mode to perform an out-of-bounds write beyond the allocated RealModeMemory buffer into the hypervisor heap. This could potentially lead to memory corruption within the hypervisor, which may affect hypervisor stability or security. However, there are no known exploits in the wild. The product is end-of-life and unsupported, so no official fixes are available.
Mitigation Recommendations
No official patch or remediation is available as the product is end-of-life and unsupported. Users should consider discontinuing use of the affected Bitdefender Napoca bare-metal hypervisor or migrating to a supported alternative. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance if available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Bitdefender
- Date Reserved
- 2026-05-28T22:57:29.491Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1efb62e29bf47b50db347c
Added to database: 6/2/2026, 3:48:50 PM
Last enriched: 6/2/2026, 4:18:45 PM
Last updated: 6/3/2026, 5:08:09 AM
Views: 9
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.