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CVE-2026-12522— Stack buffer overflow in Zephyr hl7800 modem driver parsing network-supplied +CGCONTRDP address fields

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.

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 2.4.0版本至4.4.2之前版本存在缓冲区错误漏洞，该漏洞源于HL7800蜂窝调制解调器驱动程序的+CGCONTRDP响应处理程序解析PDP上下文动态参数时，未对字段长度进行正确限制，导致栈缓冲区溢出，可能允许恶意蜂窝网络通过特制响应远程触发崩溃或控制流劫持。

CVSS 8.8 · High EPSS 0.22% · P13

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 2.4.0< 4.4.2 affected
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I. Basic Information for CVE-2026-12522

Vulnerability Information
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Vulnerability Title
Stack buffer overflow in Zephyr hl7800 modem driver parsing network-supplied +CGCONTRDP address fields
Source: CVE Program / CVE List V5
Vulnerability Description
The HL7800 cellular modem driver's +CGCONTRDP: response handler on_cmd_atcmdinfo_ipaddr() in drivers/modem/vendor_standalone/hl7800.c parses the PDP-context dynamic parameters (local address, subnet mask, gateway, and DNS servers) that the cellular network assigns to the device. The response is linearized into a 256-byte stack buffer, after which each address field length is computed from comma/. delimiter positions in the network-supplied data and used directly as the length argument to strncpy() into the fixed 64-byte stack buffer temp_addr_str (and the 16-byte iface_ctx.dns_v4_string). Because the field length is derived from attacker-controlled delimiter positions and was not bounded against the destination buffer, a single field can be far larger than 64 bytes. A malicious or impersonated cellular network (for example a rogue base station) can return a crafted +CGCONTRDP response with an overlong address field, causing strncpy() to write past temp_addr_str on the modem worker thread's stack, plus an out-of-bounds NUL write at temp_addr_str[addr_len]. No device-side privileges or user interaction are required: the device itself issues the AT+CGCONTRDP=1 query during normal network attach and parses whatever the network returns. The overflow corrupts adjacent stack memory in supervisor context, yielding at minimum a remotely triggerable crash and potentially control-flow hijacking on targets without stack protection. The fix bounds every field length against its destination buffer (temp_addr_str and dns_v4_string) before each copy, rejecting overlong fields.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr Project Zephyr 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
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 2.4.0版本至4.4.2之前版本存在缓冲区错误漏洞，该漏洞源于HL7800蜂窝调制解调器驱动程序的+CGCONTRDP响应处理程序解析PDP上下文动态参数时，未对字段长度进行正确限制，导致栈缓冲区溢出，可能允许恶意蜂窝网络通过特制响应远程触发崩溃或控制流劫持。
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 2.4.0 ~ 4.4.2 -

II. Public POCs for CVE-2026-12522

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III. Intelligence Information for CVE-2026-12522

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Patches & Fixes for CVE-2026-12522 (1)

Vendor Advisories for CVE-2026-12522 (1)

Same Patch Batch · zephyrproject · 2026-08-19 · 3 CVEs total

CVE-2026-12633 8.1 HIGH Out-of-bounds write in IPv6 6LoWPAN Context Option handling via unauthenticated Router Adv
CVE-2026-12634 5.3 MEDIUM Out-of-bounds stack write in the settings NVS backend from over-reported nvs_read length

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-787

V. Comments for CVE-2026-12522

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