Critical [CVE-2026-47876] VMXNET3 out-of-bounds write vulnerability
This critical-severity VMware (Broadcom) advisory covers CVE-2026-47876 affecting Cloud Foundation, vSphere Foundation, ESX.
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Summary
VMware ESX contains an out-of-bounds write vulnerability in the VMXNET3 virtual network adapter. A malicious actor with local administrative privileges on a virtual machine with VMXNET3 virtual network adapter may exploit this issue to execute code on the host.
Non VMXNET3 virtual adapters are not affected by this issue. Affected products named by the advisory: Cloud Foundation; vSphere Foundation; Telco Cloud Platform.
- Cloud Foundation 9.1.x.x
- Cloud Foundation 9.0.x.x
- Cloud Foundation 5.x
- vSphere Foundation 9.1.x.x
- vSphere Foundation 9.0.x.x
- ESX 9.1.x.x before ESXi-9.1.0.0200-25557999
- ESX 9.0.x.x before ESXi-9.0.2.0100-25595025
- ESX 8.0 before ESXi80U3k-25595708
- Telco Cloud Platform 5.1.x
- Telco Cloud Platform 5.0.x
Official advisory · high-confidence parse· fetched 3 months ago·verify at source
- ESXi-9.1.0.0200-25557999
- ESXi-9.0.2.0100-25595025
- ESXi80U3k-25595708
Official advisory · high-confidence parse· fetched 3 months ago·verify at source
Mitigation
Upgrade to a fixed release: ESXi-9.1.0.0200-25557999, ESXi-9.0.2.0100-25595025, ESXi80U3k-25595708. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 3 months ago·verify at source
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