CVE-2026-10046 Out-of-bounds write in Napoca BIOS INT 0x15 E820 memory map handler (VA-13905)
A malicious guest can trigger an out-of-bounds write in the hypervisor's BIOS handler, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-10046?
CVE-2026-10046 is a high-severity memory corruption vulnerability in Bitdefender Napoca bare-metal hypervisor, published on 2 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-787
Which versions are affected by CVE-2026-10046?
It affects 1 product.
Products include Bitdefender Napoca.
How do I fix CVE-2026-10046?
No fix has been published for CVE-2026-10046 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-10046 being exploited?
There is no known exploitation of CVE-2026-10046 in the wild and no public exploit code.
Other vulnerabilities in Bitdefender Napoca bare-metal hypervisor
Sources
Also known as GHSA-mpc3-vg75-whww.