What is the CVSS score of CVE-2026-4652?

CVE-2026-4652 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of Freebsd are affected by CVE-2026-4652?

CVE-2026-4652 presents notable security risk, a null pointer dereference vulnerability rated CVSS 7.5. Exploitation could compromise the security of affected deployments.

How to fix or mitigate CVE-2026-4652?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

Freebsd CVE-2026-4652

EUVD-2026-16130 HIGH

NULL Pointer Dereference (CWE-476)

2026-03-26 freebsd

GHSA-wr95-7j53-j5c2

Denial Of Service Null Pointer Dereference Freebsd

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

EUVD ID Assigned

Mar 26, 2026 - 06:30 euvd

EUVD-2026-16130

Analysis Generated

Mar 26, 2026 - 06:30 vuln.today

CVE Published

Mar 26, 2026 - 06:15 nvd

HIGH 7.5

DescriptionCVE.org

On a system exposing an NVMe/TCP target, a remote client can trigger a kernel panic by sending a CONNECT command for an I/O queue with a bogus or stale CNTLID.

An attacker with network access to the NVMe/TCP target can trigger an unauthenticated Denial of Service condition on the affected machine.

AnalysisAI

NVMe/TCP targets are vulnerable to unauthenticated denial of service when a remote attacker sends a CONNECT command with an invalid CNTLID, triggering a kernel panic on the exposed system. The vulnerability exploits a null pointer dereference that allows any network-accessible attacker to crash the target without authentication. No patch is currently available for this high-severity flaw.

Technical ContextAI

NVMe/TCP (NVMe over Fabrics using TCP) is a protocol specification that extends NVMe (Non-Volatile Memory Express) functionality over network transports, enabling remote block storage access. FreeBSD implements an NVMe/TCP target (server-side) that accepts client connections to provision remote storage. The vulnerability stems from a null pointer dereference (CWE-476) in the CONNECT command handler for I/O queues when processing a CNTLID parameter that is either invalid, expired, or not yet initialized. The NVMe/TCP specification defines the CONNECT command as the mechanism for clients to establish queue pairs; improper validation of the CNTLID field fails to check if the referenced controller exists or is valid before dereferencing it in kernel memory, triggering a panic. The affected product is FreeBSD across all versions with NVMe/TCP target support enabled (CPE: cpe:2.3:a:freebsd:freebsd:*:*:*:*:*:*:*:*).

RemediationAI

Immediately apply the security patch provided in FreeBSD security advisory FreeBSD-SA-26:07.nvmf (https://security.freebsd.org/advisories/FreeBSD-SA-26:07.nvmf.asc) by upgrading to the patched FreeBSD release version specified in the advisory. As an interim mitigation for systems unable to patch immediately, restrict network access to NVMe/TCP target ports (typically TCP port 4420) using firewall rules or network segmentation, allowing connections only from trusted, authenticated client networks. Disable NVMe/TCP target services entirely if not actively required for business operations. Monitor system logs for kernel panics correlated with NVMe/TCP connection attempts, which may indicate exploitation attempts.