Guest-to-hypervisor heap overwrite via unchecked stack offset
Published Jun 2, 2026 · Updated Jun 2, 2026
Out-of-bounds write in Bitdefender Napoca Hypervisor allows guest OS users to corrupt hypervisor heap memory via crafted SS and SP values. The real-mode hook handler in napoca/kernel/handler.c uses a guest-controlled SS:SP-derived offset to index the 1MB RealModeMemory buffer without validating its bounds before pushing an IRET frame. Low-privileged guest access is required; an offset up to 0x10FFEF writes 65,519 bytes beyond the buffer into the hypervisor heap.
Summary
What happened
Out-of-bounds write in Bitdefender Napoca Hypervisor allows guest OS users to corrupt hypervisor heap memory via crafted SS and SP values. The real-mode hook handler in napoca/kernel/handler.c uses a guest-controlled SS:SP-derived offset to index the 1MB RealModeMemory buffer without validating its bounds before pushing an IRET frame. Low-privileged guest access is required; an offset up to 0x10FFEF writes 65,519 bytes beyond the buffer into the hypervisor heap.
The record
- CVE
- CVE-2026-10047
- Published
- Jun 2, 2026
- Updated
- Jun 2, 2026
- Vendor
- Bitdefender
- Product
- Napoca Hypervisor
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 2, 2026CVE publishedPublication date reported by the CVE source.
- Jun 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=all
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What is affected?
Published CVSS scores
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Attacks
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Technologies
Your stack
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Your stack
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