CVE-2026-12631— Zephyr Project Zephyr 授权问题漏洞
一分钟漏洞结论
影响对象
zephyrproject zephyr
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Zephyr Project Zephyr是Zephyr Project组织开源的一款面向物联网设备的实时操作系统。 Zephyr Project Zephyr 2.3.0版本至4.4.2之前版本存在授权问题漏洞，该漏洞源于对k_thread_join()和k_thread_abort()系统调用的验证错误，可能导致未授权用户线程崩溃内核或绕过访问控制。
影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| zephyrproject | zephyr | 2.3.0< 4.4.2 |
affected |
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一、 漏洞 CVE-2026-12631 基础信息
漏洞信息
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Vulnerability Title
Broken access-control denial in k_thread_join/k_thread_abort syscall validation in Zephyr kernel
来源: CVE Program / CVE List V5
Vulnerability Description
The Zephyr kernel validates the k_thread_join() and k_thread_abort() system calls (declared __syscall in include/zephyr/kernel.h) through thread_obj_validate() in kernel/thread.c. Its default switch branch is the access-denied path, taken when k_object_validate() returns -EPERM (the calling user thread was never granted access to the target thread object) or -EBADF (the supplied pointer is not a registered kernel object of the right type). That branch invoked K_OOPS(K_SYSCALL_VERIFY_MSG(ret, "access denied")), but K_SYSCALL_VERIFY_MSG treats a true expression as success; the non-zero error code ret therefore read as "verified OK", the kernel oops was never raised, and control fell through to CODE_UNREACHABLE.
Because k_thread_join() and k_thread_abort() are system calls, an unprivileged user-mode thread (under CONFIG_USERSPACE) can reach this denial path directly by calling either syscall on a thread object it does not own. Instead of the offending thread being cleanly terminated, execution reaches __builtin_unreachable() while running in supervisor mode inside the syscall handler.
On Clang builds CODE_UNREACHABLE emits an illegal-instruction trap, so a user thread can deterministically crash the kernel — a locally triggerable denial of service that escapes the userspace sandbox. On GCC builds the path is undefined behavior: the compiler may drop the return-value handling for thread_obj_validate(), so it can return an undefined bool; if that is false, the caller proceeds into the real k_thread_join()/k_thread_abort() implementation for a thread the user was never authorized to access, an access-control bypass.
The fix changes the verification expression to ret == 0, so a denied (non-zero) result now correctly raises K_OOPS and terminates the offending caller.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
来源: CVE Program / CVE List V5
Vulnerability Title
Zephyr Project Zephyr 授权问题漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Zephyr Project Zephyr是Zephyr Project组织开源的一款面向物联网设备的实时操作系统。 Zephyr Project Zephyr 2.3.0版本至4.4.2之前版本存在授权问题漏洞，该漏洞源于对k_thread_join()和k_thread_abort()系统调用的验证错误，可能导致未授权用户线程崩溃内核或绕过访问控制。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| zephyrproject | zephyr | 2.3.0 ~ 4.4.2 | - |
|
二、漏洞 CVE-2026-12631 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-12631 补丁与修复 (1)
CVE-2026-12631 厂商安全公告 (1)
同批安全公告 · zephyrproject · 2026-08-18 · 共 3 条
| CVE-2026-12632 | 6.5 MEDIUM | Zephyr Project Zephyr 缓冲区错误漏洞 |
| CVE-2026-12520 | 6.4 MEDIUM | Zephyr 缓冲区错误漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-12631
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