CVE-2024-51564Network attack vector

Host denial of service via invalid CORB pointer

Published Nov 12, 2024 · Updated Nov 3, 2025

Improper input validation in FreeBSD bhyve allows guest OS users to hang the host through an emulated HDA audio device. The HDA CORB runner accepts an HDAC_CORBWP value that is not less than the ring size, so its modulo-sized read pointer can never reach the invalid write pointer and processing spins indefinitely. Exploitation requires control of a guest configured with the HDA device and interrupts the affected bhyve host workload.

CVSS severity7.5
High
EPSS probability0.46%
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

Improper input validation in FreeBSD bhyve allows guest OS users to hang the host through an emulated HDA audio device. The HDA CORB runner accepts an HDAC_CORBWP value that is not less than the ring size, so its modulo-sized read pointer can never reach the invalid write pointer and processing spins indefinitely. Exploitation requires control of a guest configured with the HDA device and interrupts the affected bhyve host workload.

The record

CVE
CVE-2024-51564
Published
Nov 12, 2024
Updated
Nov 3, 2025
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-1285, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record 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_p8
  2. Affected versionversion=13.3-RELEASE <p8
  3. Affected versionversion=13.4 <13.4_p2
  4. Affected versionversion=13.4-RELEASE <p2
  5. Affected versionversion=14.1 <14.1_p6
  6. Affected versionversion=14.1-RELEASE <p6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The FreeBSD Project · FreeBSDversion=13.3 <13.3_p8; version=13.3-RELEASE <p8; version=13.4 <13.4_p2; version=13.4-RELEASE <p2; version=14.1 <14.1_p6; version=14.1-RELEASE <p6

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1285Improper Validation of Specified Index, Position, or Offset in Input
T1499.004Application or System Exploitation

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