CVE-2026-12363— Zephyr Project zephyr 缓冲区错误漏洞
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组织开源的一个面向物联网设备的实时操作系统。 Zephyr Project zephyr 3.7.0版本至4.5.0之前版本存在缓冲区错误漏洞，该漏洞源于未验证接收到的DATA_FRAGMENT命令中的分片计数器，导致分片计数器为0时发生下溢和越界写入，可能造成解码器状态损坏和拒绝服务。
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| zephyrproject | zephyr | 3.7.0< 4.5.0 |
affected |
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一、 漏洞 CVE-2026-12363 基础信息
漏洞信息
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Vulnerability Title
Out-of-bounds write in LoRaWAN fragmented transport from a fragment index of 0
来源: CVE Program / CVE List V5
Vulnerability Description
The LoRaWAN Fragmented Data Block Transport service (subsys/lorawan/services/frag_transport.c) does not validate the fragment counter in a received DATA_FRAGMENT command before forwarding it to the configured decoder. In frag_transport_package_callback() the value frag_counter = hdr->frag_index_n & 0x3FFF is taken directly from the downlink payload and passed to the decoder, which derives an array index and flash offset as frag_counter - 1. DataFragment fragments are 1-indexed, so a frag_counter of 0 underflows that arithmetic.
With the default Semtech/LoRaMAC-node decoder, this reaches FragDecoder.FragNbMissingIndex[fragCounter - 1] = 0; in FragDecoderProcess(), where fragCounter - 1 evaluates to -1 and writes a uint16_t zero out of bounds, just before the array and into the adjacent MatrixM2B recovery-matrix state of the static decoder object (CWE-787). A companion write derives a wild flash offset, but that path is rejected by the flash_area_write() bounds check. The in-tree low-memory decoder (frag_dec()) is not corrupted: its out-of-range bit-array and flash accesses are caught by sys_bitarray_ and flash_area_ bounds checks.
The handler is the registered downlink callback for the fragmentation transport port, reachable whenever an active fragmentation session exists, so the triggering byte is attacker-influenceable LoRaWAN/FUOTA network input. Triggering it requires authenticated downlinks (LoRaWAN MAC session keys or a malicious/compromised network or FUOTA server) and an active fragmentation session. The impact is contained: corruption of decoder state and denial of the firmware-update (FUOTA) session rather than controllable memory corruption or code execution. The fix adds a transport-layer check that rejects frag_counter == 0, closing the defect for both decoder backends.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
来源: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
来源: CVE Program / CVE List V5
Vulnerability Title
Zephyr Project zephyr 缓冲区错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Zephyr Project zephyr是Zephyr Project组织开源的一个面向物联网设备的实时操作系统。 Zephyr Project zephyr 3.7.0版本至4.5.0之前版本存在缓冲区错误漏洞，该漏洞源于未验证接收到的DATA_FRAGMENT命令中的分片计数器，导致分片计数器为0时发生下溢和越界写入，可能造成解码器状态损坏和拒绝服务。
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 | 3.7.0 ~ 4.5.0 | - |
|
二、漏洞 CVE-2026-12363 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-12363 补丁与修复 (1)
CVE-2026-12363 厂商安全公告 (1)
同批安全公告 · zephyrproject · 2026-08-14 · 共 4 条
| CVE-2026-12366 | 8.8 HIGH | Zephyr Project zephyr 资源管理错误漏洞 |
| CVE-2026-12364 | 8.4 HIGH | Zephyr Project zephyr 缓冲区错误漏洞 |
| CVE-2026-12365 | 5.8 MEDIUM | Zephyr Project zephyr 资源管理错误漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-12363
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