Hypervisor code execution via VMSVGA buffer overflow
Published Jan 20, 2026 · Updated Jan 20, 2026
Out-of-bounds write in Oracle VM VirtualBox 7.1.14 and 7.2.4 allows local users in a guest VM to execute code in the host hypervisor. The VMSVGA virtual graphics device fails to validate guest-controlled data before writing it, permitting a write past an allocated buffer. Exploitation requires high-privileged code execution in a guest VM and yields arbitrary hypervisor-context code execution, enabling a guest-to-host escape.
Summary
What happened
Out-of-bounds write in Oracle VM VirtualBox 7.1.14 and 7.2.4 allows local users in a guest VM to execute code in the host hypervisor. The VMSVGA virtual graphics device fails to validate guest-controlled data before writing it, permitting a write past an allocated buffer. Exploitation requires high-privileged code execution in a guest VM and yields arbitrary hypervisor-context code execution, enabling a guest-to-host escape.
The record
- CVE
- CVE-2026-21957
- Published
- Jan 20, 2026
- Updated
- Jan 20, 2026
- Vendor
- Oracle
- Product
- Oracle VM VirtualBox
- Classifications
- CWE-269, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jan 20, 2026CVE publishedPublication date reported by the CVE source.
- Jan 20, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=7.1.14
- Affected versionversion=7.2.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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