CVE-2024-39281Public exploitNetwork attack vector

Host denial of service via unbounded kernel allocation

Published Nov 12, 2024 · Updated Jan 10, 2025

Denial of service in FreeBSD 13.3, 13.4, and 14.1 allows guest OS users to exhaust host kernel memory via a crafted SCSI command. ctl_persistent_reserve_out converts the caller-controlled 32-bit parameter length directly into a blocking kernel malloc request without an upper bound. Only hosts using virtio_scsi or ctld expose the path, and memory exhaustion can interrupt the host and its workloads.

CVSS severity5.3
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in FreeBSD 13.3, 13.4, and 14.1 allows guest OS users to exhaust host kernel memory via a crafted SCSI command. ctl_persistent_reserve_out converts the caller-controlled 32-bit parameter length directly into a blocking kernel malloc request without an upper bound. Only hosts using virtio_scsi or ctld expose the path, and memory exhaustion can interrupt the host and its workloads.

The record

CVE
CVE-2024-39281
Published
Nov 12, 2024
Updated
Jan 10, 2025
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Jan 10, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <*
  2. Affected versionversion=13.3-RELEASE <p8
  3. Affected versionversion=13.4-RELEASE <p2
  4. Affected versionversion=14.1-RELEASE <p6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The FreeBSD Project · FreeBSDversion=0 <*; version=13.3-RELEASE <p8; version=13.4-RELEASE <p2; version=14.1-RELEASE <p6

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5NetAppCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Application or System Exploitation

Public exploit references

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

Technologies

Your stack

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Your stack

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