• Advisory Details Oracle VirtualBox VMSVGA Out-Of-Bounds Access Local Privilege Escalation Vulnerability ZDI-26-103ZDI-CAN-27923 This vulnerability allows local attackers to escalate privileges 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 specific flaw exists within the VMSVGA device. • The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated array. • An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor. • 2025-09-25 - Vulnerability reported to vendor 2026-02-13 - Coordinated public release of advisory 2026-02-13 - Advisory Updated General Inquiries Find us on X Find us on Mastodon Media Inquiries Sensitive Email Communications Our Mission TrendAI TippingPoint IPS Process Researcher Rewards FAQS Privacy Published Advisories Upcoming Advisories RSS Feeds

Advisory Details Oracle VirtualBox VMSVGA Out-Of-Bounds Write Local Privilege Escalation Vulnerability ZDI-26-102ZDI-CAN-27938 This vulnerability allows local attackers to escalate privileges on affected installations of Oracle VirtualBox.

Article Summaries:

  • Oracle has disclosed a local privilege‑escalation flaw (CVE‑2026‑21956) in its VirtualBox virtualization software. The vulnerability resides in the VMSVGA graphics device and allows an attacker who already runs high‑privileged code on a guest system to exploit an out‑of‑bounds memory access, potentially executing arbitrary code in the hypervisor. Oracle has released a patch to address the issue, and the update is available through its security alert for January 2026. The flaw was reported by the security research group VMBreakers (GANGMIN KIM, SANGBIN KIM, Un3xploitable).
  • CVE ID | CVE-2026-21957 | CVSS SCORE | 7.5, AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H | AFFECTED VENDORS | Oracle | AFFECTED PRODUCTS | VirtualBox | VULNERABILITY DETAILS | This vulnerability allows local attackers to escalate privileges 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 specific flaw exists within the VMSVGA device. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an alloc

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