ZDI-26-640: Oracle VirtualBox VirtioSCSI Uninitialized Memory Information Disclosure Vulnerability
ZDI detailed an uninitialized memory flaw in Oracle VirtualBox's VirtioSCSI (CVE-2026-71132) allowing local attackers to disclose sensitive information.
Zero Day Initiative published ZDI-26-640, a CVSS 5.3 information disclosure vulnerability in the VirtioSCSI component of Oracle VirtualBox. An attacker must first run high-privileged code on the guest system before the uninitialized memory issue can be used to disclose sensitive information. The flaw is tracked as CVE-2026-71132. The advisory reports no exploitation activity.
- Uninitialized memory disclosure in VirtualBox VirtioSCSI, tracked as CVE-2026-71132
- CVSS 5.3; requires high-privileged code execution on the guest first
- Published as ZDI-26-640 by the Zero Day Initiative
- No in-the-wild exploitation reported
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2026-71132 | Information Disclosure in Oracle VM VirtualBox 7.2.14 (VirtioSCSI) CVE-2026-71132 is a flaw in the core of Oracle VM VirtualBox, tagged CWE-284 (improper access control); the related ZDI advisory (ZDI-26-640) describes it as an uninitialized-memory information disclosure in VirtualBox's VirtioSCSI handling. It is difficult to exploit (high attack complexity) and requires a high-privileged attacker with local logon to the infrastructure where VirtualBox runs, with no user interaction needed. A successful attack yields unauthorized access to critical data or complete access to all VirtualBox-accessible data, and because of a scope change the impact can extend to additional products beyond VirtualBox itself; there is no integrity or availability impact. Per Oracle's advisory, the supported version affected is VirtualBox 7.2.14, so hosts running that release are exposed. No exploitation is currently known: it is not in CISA's KEV, no public proof-of-concept exists, and EPSS estimates only a 0.1% probability of exploitation in the next 30 days. Do: Plan an upgrade to the first Oracle VM VirtualBox release newer than 7.2.14 as published in Oracle's Critical Patch Update advisory, since 7.2.14 is the affected supported version. Until patched, limit high-privileged local logon on hosts running VirtualBox to trusted administrators and inventory VMs using VirtioSCSI controllers given the ZDI-26-640 attribution. There is no KEV-mandated deadline or public exploit, so this fits a routine patch-cadence workflow rather than emergency response. | 5.3 | <1% |
| massmillions of VirtualBox installations worldwide (order of magnitude >1M), though only deployments on the 7.2.14 release are confirmed affected |
This vulnerability allows local attackers to disclose sensitive information on affected installations of Oracle VirtualBox. An attacker must first obtain the ability to execute high-privileged code on the target guest system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 5.3. The following CVEs are assigned: CVE-2026-71132.
This source does not provide full text. Read it at zerodayinitiative.com.