CVE-2024-41721

Guest-to-host code execution via unchecked XHCI slot index

Published Sep 20, 2024 · Updated Sep 26, 2024

Out-of-bounds read in bhyve XHCI emulation in FreeBSD allows guest OS users to crash the hypervisor or execute code on the host. Several pci_xhci command handlers use a guest-controlled slot index to access the slot-device array without rejecting zero or values above XHCI_MAX_SLOTS. Exploitation requires privileged software in a guest VM and an emulated XHCI controller; the result is a bhyve process crash or host-side code execution.

CVSS severity8.1
High
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in bhyve XHCI emulation in FreeBSD allows guest OS users to crash the hypervisor or execute code on the host. Several pci_xhci command handlers use a guest-controlled slot index to access the slot-device array without rejecting zero or values above XHCI_MAX_SLOTS. Exploitation requires privileged software in a guest VM and an emulated XHCI controller; the result is a bhyve process crash or host-side code execution.

The record

CVE
CVE-2024-41721
Published
Sep 20, 2024
Updated
Sep 26, 2024
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-125, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=13.3 <13.3_p7
  2. Affected versionversion=13.3-RELEASE <p7
  3. Affected versionversion=13.4 <13.4_p1
  4. Affected versionversion=13.4-RELEASE <p1
  5. Affected versionversion=14.0 <14.0_p11
  6. Affected versionversion=14.0-RELEASE <p11
  7. Affected versionversion=14.1 <14.1_p5
  8. Affected versionversion=14.1-RELEASE <p5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The FreeBSD Project · FreeBSDversion=13.3 <13.3_p7; version=13.3-RELEASE <p7; version=13.4 <13.4_p1; version=13.4-RELEASE <p1; version=14.0 <14.0_p11; version=14.0-RELEASE <p11; version=14.1 <14.1_p5; version=14.1-RELEASE <p5

Published CVSS scores

8.1CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo