CVE-2024-32668: bhyve(8) privileged guest escape via USB controller

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-09-05 · updated 2026-06-17
Weakness: CWE-193

Description

An insufficient boundary validation in the USB code could lead to an out-of-bounds write on the heap, with data controlled by the caller. A malicious, privileged software running in a guest VM can exploit the vulnerability to achieve code execution on the host in the bhyve userspace process, which typically runs as root. Note that bhyve runs in a Capsicum sandbox, so malicious code is constrained by the capabilities available to the bhyve process.

Affected products

FreeBSD: from 13.0 before 13.3; 13.3, 13.3-p1, 13.3-p2, 13.3-p3, 13.3-p4, 13.3-p5 (+18) — fixed in 13.3

How to fix

Upgrade to a fixed version: FreeBSD 13.3. Check the vendor advisory for mitigations.

References

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