CVE-2026-4652Network attack vector

Kernel panic via null controller dereference

Published Mar 26, 2026 · Updated Mar 26, 2026

Null pointer dereference in FreeBSD 15.0-RELEASE through p4 allows remote attackers to panic an NVMe/TCP target with an I/O CONNECT. In nvmft_handoff_io_queue(), the nonexistent-controller error path dereferences the null ctrlr pointer to log ctrlr->cntlid instead of using the received CNTLID value. Network access to an exposed NVMe/TCP target is sufficient, and a bogus or stale CNTLID crashes the kernel without authentication.

CVSS severity7.5
High
EPSS probability0.37%
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

Null pointer dereference in FreeBSD 15.0-RELEASE through p4 allows remote attackers to panic an NVMe/TCP target with an I/O CONNECT. In nvmft_handoff_io_queue(), the nonexistent-controller error path dereferences the null ctrlr pointer to log ctrlr->cntlid instead of using the received CNTLID value. Network access to an exposed NVMe/TCP target is sufficient, and a bogus or stale CNTLID crashes the kernel without authentication.

The record

CVE
CVE-2026-4652
Published
Mar 26, 2026
Updated
Mar 26, 2026
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 2026Record 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=15.0-RELEASE <p5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The FreeBSD Project · FreeBSDversion=15.0-RELEASE <p5

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-476NULL Pointer Dereference
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