A significant security flaw has been identified within VMware Fusion, a popular virtualization tool for macOS offered by Broadcom. This vulnerability, classified as high-severity, allows local attackers to escalate their privileges to root access on systems that are affected.
Details of the VMware Fusion Vulnerability
The flaw, labeled as CVE-2026-41702, was discreetly reported to Broadcom and subsequently patched on May 14, 2026, under the security advisory VMSA-2026-0003. This issue arises from a Time-of-Check Time-of-Use (TOCTOU) race condition that affects a SETUID binary operation within VMware Fusion.
TOCTOU vulnerabilities take advantage of the timing gap between when a resource’s state is checked and when it is actually used. During this window, attackers can introduce harmful modifications to gain unauthorized elevated operations.
Impact on Users and Systems
Any user operating VMware Fusion version 25H2 on macOS is susceptible to this attack. The exploit requires only local, non-administrative user privileges, eliminating the need for administrative rights or remote access. An attacker already on the system, such as an insider with low privileges or a standard user account process, can leverage this flaw to achieve root-level access.
This vulnerability is particularly concerning for shared macOS environments, development workstations, or enterprise endpoints using Fusion, where even minimal access can lead to full system compromise.
Remediation and Recommendations
Broadcom has confirmed that there are no workarounds for CVE-2026-41702. The sole solution is to implement the patch provided. Users running VMware Fusion 25H2 must upgrade to version 26H1, which contains the necessary fix. The vulnerability was responsibly disclosed by Mathieu Farrell (@coiffeur0x90) through private channels.
Given the lack of mitigating controls, it is imperative for organizations and individuals dependent on VMware Fusion to prioritize this update. SETUID-related TOCTOU vulnerabilities are well-documented methods exploited by threat actors for local privilege escalation. Security teams should audit all systems using VMware Fusion and ensure the 26H1 update is applied without delay.
Delaying the patch leaves systems vulnerable to direct root escalation attacks on any unpatched macOS host. For more immediate updates, follow us on Google News, LinkedIn, and X.
