CVE-2026-4652— Remote denial of service via null pointer dereference
Quick assessment
Affected
FreeBSD FreeBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于暴露NVMe/TCP目标的系统在收到针对I/O队列的伪造或过期CNTLID的CONNECT命令时可能触发内核崩溃，可能导致未经身份验证的拒绝服务攻击。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-4652
Vulnerability Information
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Vulnerability Title
Remote denial of service via null pointer dereference
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于暴露NVMe/TCP目标的系统在收到针对I/O队列的伪造或过期CNTLID的CONNECT命令时可能触发内核崩溃，可能导致未经身份验证的拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-4652
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · FreeBSD · 2026-03-26 · 3 CVEs total
| CVE-2026-4247 | TCP: remotely exploitable DoS vector (mbuf leak) | |
| CVE-2026-4747 | Remote code execution via RPCSEC_GSS packet validation |
IV. Related Vulnerabilities
Same product: FreeBSD
-
CVE-2026-58094
TOCTOU race in POSIX shared memory large page configuration -
CVE-2026-58093
Kernel use-after-free via tty ioctls -
CVE-2026-58097
ppp(8): missing length validation in mp_SetEnddisc() -
CVE-2026-58096
ppp(8): missing length validation in LcpDecodeConfig() -
CVE-2026-58095
ppp(8): incorrect length calculation in mp_Enddisc()
Same vendor: FreeBSD
-
CVE-2026-58094
TOCTOU race in POSIX shared memory large page configuration -
CVE-2026-58093
Kernel use-after-free via tty ioctls -
CVE-2026-58097
ppp(8): missing length validation in mp_SetEnddisc() -
CVE-2026-58096
ppp(8): missing length validation in LcpDecodeConfig() -
CVE-2026-58095
ppp(8): incorrect length calculation in mp_Enddisc()
Same weakness: CWE-476
-
CVE-2026-108093
Gimp: gimp: denial of service via null pointer dereference i -
CVE-2026-104114
NULL pointer dereference in illumos nwamd door handler allow -
CVE-2026-108063
Libhangul: null pointer dereference in hanja_new() when look -
CVE-2026-107655
Cups: null pointer dereference via embedded job ticket comme -
CVE-2026-107890
CUPS漏洞：空指针解引用致服务崩溃
V. Comments for CVE-2026-4652
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