CVE-2026-11985— zephyrproject zephyr 信息泄露漏洞
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。
zephyrproject zephyr是zephyrproject组织开源的一个面向物联网设备的实时操作系统。 zephyrproject zephyr 1.13.0版本至4.4.1版本存在信息泄露漏洞，该漏洞源于ARM端口启用硬件FPU时未正确启用FPU寄存器共享，导致上下文切换时未保存调用者保存的浮点寄存器状态，可能造成信息泄露或跨线程FP状态损坏。
影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| zephyrproject | zephyr | 1.13.0< 4.4.2 |
affected |
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一、 漏洞 CVE-2026-11985 基础信息
漏洞信息
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Vulnerability Title
Cross-thread FPU register leak on ARM when FPU enabled without register sharing
来源: CVE Program / CVE List V5
Vulnerability Description
On the Zephyr ARM port, enabling the hardware FPU (CONFIG_FPU) forces the "Floating point ABI" choice, which defaults to CONFIG_FP_HARDABI. Both FP_HARDABI and FP_SOFTABI permit the compiler to emit hardware FP instructions in any function, even code that never uses floating-point types. However, the callee-saved FP registers (s16-s31 / d8-d15) are only saved and restored across a context switch when CONFIG_FPU_SHARING is enabled (arch/arm/core/cortex_m/swap_helper.S and arch/arm/core/cortex_a_r/swap_helper.S), and prior to this fix selecting an ABI did not enable FPU register sharing, which defaults off.
In a build that enables the FPU with the default ABI but leaves CONFIG_FPU_SHARING disabled, the kernel preserves no callee-saved FP register state across thread switches. The documented precondition for this "unshared" mode — that only a single thread ever executes FP instructions — is silently violated because the compiler may generate FP instructions in every thread.
Under CONFIG_USERSPACE, where threads are mutually isolated, this becomes an information-disclosure boundary crossing: a victim thread can leave secret-derived values in s16-s31, and a co-resident unprivileged thread can read those registers directly (FP register access is not privilege-gated), recovering data left behind by another thread. Without userspace the same defect causes cross-thread FP state corruption (a correctness fault). The leak is bounded to the 16 callee-saved single-precision registers and is opportunistic, so impact is low.
The fix makes FP_HARDABI and FP_SOFTABI select CONFIG_FPU_SHARING and tags every thread with K_FP_REGS at creation, so callee-saved FP state is always preserved across context switches whenever the compiler may emit FP instructions.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
信息暴露
来源: CVE Program / CVE List V5
Vulnerability Title
zephyrproject zephyr 信息泄露漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
zephyrproject zephyr是zephyrproject组织开源的一个面向物联网设备的实时操作系统。 zephyrproject zephyr 1.13.0版本至4.4.1版本存在信息泄露漏洞，该漏洞源于ARM端口启用硬件FPU时未正确启用FPU寄存器共享，导致上下文切换时未保存调用者保存的浮点寄存器状态，可能造成信息泄露或跨线程FP状态损坏。
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 | 1.13.0 ~ 4.4.2 | - |
|
二、漏洞 CVE-2026-11985 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-11985 补丁与修复 (1)
CVE-2026-11985 厂商安全公告 (1)
同批安全公告 · zephyrproject · 2026-08-11 · 共 5 条
| CVE-2026-11893 | 5.9 MEDIUM | zephyrproject zephyr 资源管理错误漏洞 |
| CVE-2026-11894 | 5.9 MEDIUM | zephyrproject zephyr 资源管理错误漏洞 |
| CVE-2026-12052 | 5.2 MEDIUM | zephyrproject zephyr 缓冲区错误漏洞 |
| CVE-2026-12051 | 4.6 MEDIUM | zephyrproject zephyr 异常处理不当漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-11985
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