CVE-2026-21986

HIGH

Oracle VM VirtualBox 7.1.14 and 7.2.4 - Unauthenticated Denial of Service

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-21986. PoCs published by MohaBars.

AI-analyzed exploit summary This repository contains a functional proof-of-concept exploit for CVE-2026-21986, a denial-of-service vulnerability in Oracle VM VirtualBox's Shared Folders driver. The exploit triggers kernel memory exhaustion via repeated IOCTL calls with crafted input buffers.

Description

Vulnerability in the Oracle VM VirtualBox product of Oracle Virtualization (component: Core). Supported versions that are affected are 7.1.14 and 7.2.4. Easily exploitable vulnerability allows unauthenticated attacker with logon to the infrastructure where Oracle VM VirtualBox executes to compromise Oracle VM VirtualBox. While the vulnerability is in Oracle VM VirtualBox, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle VM VirtualBox. Note: This vulnerability applies to Windows VMs only. CVSS 3.1 Base Score 7.1 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).

Exploits (1)

github WORKING POC
by MohaBars · c++poc
https://github.com/MohaBars/CVE-2026-21986-VirtualBox-DoS

This repository contains a functional proof-of-concept exploit for CVE-2026-21986, a denial-of-service vulnerability in Oracle VM VirtualBox's Shared Folders driver. The exploit triggers kernel memory exhaustion via repeated IOCTL calls with crafted input buffers.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Oracle VM VirtualBox (Shared Folders driver interface)
No auth needed
Prerequisites: Access to the VirtualBox Shared Folders driver interface
devstral-2 · analyzed Apr 28, 2026 Full analysis →

References (1)

Core 1
Core References

Scores

CVSS v3 7.1
EPSS 0.0001
EPSS Percentile 0.8%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

Status published
Products (2)
oracle/vm_virtualbox 7.1.14
oracle/vm_virtualbox 7.2.4
Published Jan 20, 2026
Tracked Since Feb 18, 2026