CVE-2026-10047: Out-of-bounds write in Napoca real-mode hook handler via guest-controlled SS:SP (VA-13905)
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-10047?
CVE-2026-10047 has a high severity rating of 8.5.
What type of vulnerability is CVE-2026-10047?
CVE-2026-10047 is an out-of-bounds write vulnerability in the Bitdefender Napoca real-mode hook handler.
How does CVE-2026-10047 affect the Bitdefender Napoca hypervisor?
CVE-2026-10047 allows an attacker to exploit an out-of-bounds write by using a guest-controlled SS:SP offset.
Is there a fix available for CVE-2026-10047?
No fix is planned for CVE-2026-10047 as the Bitdefender Napoca hypervisor is end-of-life.
What should users do about CVE-2026-10047?
Users should discontinue use of the Bitdefender Napoca hypervisor due to the unaddressed vulnerability.