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CVE-2026-66086— Stack-based Buffer Overflow in Modem

Quick assessment

Affected
Unisoc (Shanghai) Technologies Co., Ltd. Modem
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.

在调制解调器的 OTA 协议栈中，由于对 SIB1 消息中的调度信息验证不当，可能导致基于栈的缓冲区溢出。这可能导致远程代码执行或拒绝服务，且无需额外的执行权限。

CVSS 8.3 · Critical

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-66086

Vulnerability Information
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Vulnerability Title
Stack-based Buffer Overflow in Modem
Source: CVE Program / CVE List V5
Vulnerability Description
In the modem OTA stack, there is a possible stack-based buffer overflow due to improper validation of scheduling information in SIB1 messages. This could lead to remote code execution or denial of service with no additional execution privileges needed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unisoc (Shanghai) Technologies Co., Ltd. Modem T8100 -

II. Public POCs for CVE-2026-66086

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III. Intelligence Information for CVE-2026-66086

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Other References for CVE-2026-66086 (1)

Same Patch Batch · Unisoc (Shanghai) Technologies Co., Ltd. · 2026-10-12 · 3 CVEs total

CVE-2026-66085 5.5 MEDIUM Information Disclosure in Modem
CVE-2026-87765 5.5 MEDIUM Improper Input Validation in Kernel APsys DVFS

IV. Related Vulnerabilities

Same product: Modem
Same vendor: Unisoc (Shanghai) Technologies Co., Ltd.
Same weakness: CWE-121

V. Comments for CVE-2026-66086

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