CVE-2024-43102

Kernel panic via premature shared-memory free

Published Sep 5, 2024 · Updated Sep 16, 2024

Use-after-free in the FreeBSD kernel allows local users to panic the kernel by concurrently destroying anonymous shared-memory mappings. The UMTX_SHM_DESTROY path decrements a mapping object's reference count multiple times during concurrent removals, freeing it while references remain. Malicious code must run locally; the established consequence is a kernel panic, while the vendor identifies code execution and Capsicum sandbox escape as follow-on outcomes.

CVSS severity10.0
Critical
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the FreeBSD kernel allows local users to panic the kernel by concurrently destroying anonymous shared-memory mappings. The UMTX_SHM_DESTROY path decrements a mapping object's reference count multiple times during concurrent removals, freeing it while references remain. Malicious code must run locally; the established consequence is a kernel panic, while the vendor identifies code execution and Capsicum sandbox escape as follow-on outcomes.

The record

CVE
CVE-2024-43102
Published
Sep 5, 2024
Updated
Sep 16, 2024
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-416, CWE-911, T1499, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record 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=13.3 <13.3_p6
  2. Affected versionversion=13.3-RELEASE <p6
  3. Affected versionversion=14.0 <14.0_p10
  4. Affected versionversion=14.0-RELEASE <p10
  5. Affected versionversion=14.1 <14.1_p4
  6. Affected versionversion=14.1-RELEASE <p4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The FreeBSD Project · FreeBSDversion=13.3 <13.3_p6; version=13.3-RELEASE <p6; version=14.0 <14.0_p10; version=14.0-RELEASE <p10; version=14.1 <14.1_p4; version=14.1-RELEASE <p4

Published CVSS scores

10.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
CWE-911Improper Update of Reference Count
T1499Endpoint Denial of Service
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

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Your stack

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