Local Privilege Escalation in VMware Workstation VMXNET3 (CVE‑2026‑59346) Enables Hypervisor Takeover
What It Is – A integer‑overflow flaw in the VMXNET3 virtual NIC driver of VMware Workstation allows a local attacker who already runs code on a guest VM to corrupt hypervisor memory and gain hypervisor‑level privileges.
Exploitability – The vulnerability requires local code execution on the guest and manual exploitation; no public exploit code is known. CVSS v3.1 7.5 (AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H).
Affected Products – VMware Workstation (all supported versions at the time of disclosure).
Why It Matters for Trust & Control Assurance
- Access‑control integrity – The flaw bypasses the isolation boundary that controls rely on to separate privileged hypervisor functions from guest workloads.
- Continuous compliance evidence – Demonstrating that hypervisor patches are applied is a concrete control‑objective evidence point that maps to multiple frameworks (e.g., NIST CSF, ISO 27001).
- Audit‑ready posture – Enterprises must be able to prove timely remediation of privileged‑escalation vectors to satisfy auditors and regulator‑driven due‑diligence reviews.
Recommended Actions
- Deploy VMware’s security update for Workstation immediately on all endpoints.
- Verify patch status with an automated inventory tool and capture the results as compliance evidence.
- Update baseline hardening guides to require VMXNET3 driver version ≥ the patched release.
- Conduct a focused review of privileged‑access controls around hypervisor management interfaces.