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CVE-2026-10670— User-triggerable kernel NULL-pointer dereference (DoS) in `k_thread_name_copy()` syscall verifier

Quick assessment

Affected
zephyrproject zephyr
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.

zephyrproject zephyr是zephyrproject组织开源的一款实时操作系统内核。 zephyrproject zephyr 2.0.0版本至4.5.0之前版本存在异常处理不当漏洞，该漏洞源于k_thread_name_copy()系统调用的验证处理程序在解引用k_object_find()返回的struct k_object之前未检查其是否为NULL，导致未授权用户模式线程通过未注册的指针触发空指针解引用，从而造成内核模式故障、系统挂起或重启，导致拒绝服务。

CVSS 5.5 · Medium EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1562

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 3.7.0< 4.5.0 affected
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I. Basic Information for CVE-2026-10670

Vulnerability Information
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Vulnerability Title
User-triggerable kernel NULL-pointer dereference (DoS) in `k_thread_name_copy()` syscall verifier
Source: CVE Program / CVE List V5
Vulnerability Description
The CONFIG_USERSPACE verification handler for the k_thread_name_copy() system call (z_vrfy_k_thread_name_copy() in kernel/thread.c) calls k_object_find() on the caller-supplied thread pointer and then dereferences the returned struct k_object without checking it for NULL. k_object_find() returns NULL whenever the supplied pointer is not a registered (static or dynamic) kernel object. The pre-fix guard tested thread == NULL instead of ko == NULL, so an unprivileged user-mode thread that invokes k_thread_name_copy() with any non-NULL but unregistered pointer (e.g. an arbitrary address) passes the NULL test, after which the verifier reads ko->type through a NULL pointer. Because the syscall verifier runs in supervisor mode, this NULL dereference is a kernel-mode fault that halts or reboots the system, allowing untrusted user code to crash the kernel across the userspace security boundary (denial of service). The marshaller passes the thread argument to the verifier without any prior K_SYSCALL_OBJ validation, so the bad pointer reaches the defect directly. The flaw affects builds with CONFIG_USERSPACE and CONFIG_THREAD_NAME enabled and has been present since the special-case lookup was introduced around v2.0.0; it is present in v4.4.0 and earlier. The fix changes the guard to check the k_object_find() return value (ko == NULL) before dereferencing it.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
zephyrproject zephyr 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zephyrproject zephyr是zephyrproject组织开源的一款实时操作系统内核。 zephyrproject zephyr 2.0.0版本至4.5.0之前版本存在异常处理不当漏洞，该漏洞源于k_thread_name_copy()系统调用的验证处理程序在解引用k_object_find()返回的struct k_object之前未检查其是否为NULL，导致未授权用户模式线程通过未注册的指针触发空指针解引用，从而造成内核模式故障、系统挂起或重启，导致拒绝服务。
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

Vendor Product Affected Versions CPE Subscribe
zephyrproject zephyr 3.7.0 ~ 4.5.0 -

II. Public POCs for CVE-2026-10670

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III. Intelligence Information for CVE-2026-10670

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Patches & Fixes for CVE-2026-10670 (1)

Vendor Advisories for CVE-2026-10670 (1)

Same Patch Batch · zephyrproject · 2026-07-14 · 4 CVEs total

CVE-2026-10672 8.2 HIGH Unterminated URI buffer causes out-of-bounds read in LwM2M firmware pull (Package URI)
CVE-2026-10669 7.8 HIGH Xtensa MPU `arch_buffer_validate()` integer-overflow lets a user thread bypass syscall poi
CVE-2026-10671 7.1 HIGH User thread can re-initialize an in-use `k_pipe`, corrupting kernel wait queues (`CONFIG_U

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-476

V. Comments for CVE-2026-10670

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