A newly disclosed vulnerability in VMware Fusion has raised serious security concerns after researchers confirmed it could allow attackers to escalate privileges to root on affected systems.
The flaw, tracked as CVE-2026-41702, has been rated high severity with a CVSS score of 7.8, highlighting its potential impact in real-world environments.
VMware Fusion Flaw
Broadcom, which now manages VMware products, published the advisory (VMSA-2026-0003) on May 14, 2026, warning that the issue stems from a Time-of-Check Time-of-Use (TOCTOU) race condition in a SETUID binary.
This type of vulnerability occurs when a system checks a condition but later uses the result without verifying whether it has changed, leaving an opportunity for exploitation.
According to Broadcom, a local attacker with non-administrative privileges can exploit this flaw to gain root-level access.
This effectively gives full control over the affected system, allowing attackers to execute arbitrary commands, modify sensitive files, or deploy persistent malware.
Security researcher Mathieu Farrell (@coiffeur0x90) was credited with responsibly reporting the vulnerability.
While no active exploitation has been publicly confirmed at the time of disclosure, the simplicity of the attack vector, requiring only local access and no user interaction, makes it particularly dangerous in shared or enterprise environments.
The vulnerability impacts VMware Fusion version 25H2 running on any supported platform. Organizations and individual users relying on Fusion for virtualization tasks, including development, testing, and sandboxing, are especially at risk if systems are not promptly updated.
Broadcom has released a fix in VMware Fusion version 26H1, which addresses the vulnerability. Notably, there are currently no available workarounds, making patching the only effective mitigation strategy.
The vulnerability’s characteristics, low attack complexity, no user interaction, and high impact on confidentiality, integrity, and availability, make it attractive to attackers seeking to escalate privileges after initial access. In enterprise environments, such flaws are often chained with other vulnerabilities to achieve full system compromise.
Security experts recommend updating to the latest version of VMware Fusion immediately to reduce exposure. Additionally, organizations should enforce strict access controls, limit local user privileges, and monitor systems for unusual activity that could indicate exploitation attempts.
This incident highlights the ongoing risks associated with local privilege escalation vulnerabilities, especially in widely used virtualization platforms. As attackers increasingly target developer tools and virtualization environments, timely patching and proactive security monitoring remain critical defenses.
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