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TI-2026-70814 Aliases CVE-2026-66086GHSA-x9v2-w4w8-7v7g

Stack-based buffer overflow in Unisoc modem lets attackers run code

Priority MEDIUM 44CWE-121Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

The Modem component from Unisoc (Shanghai) Technologies Co., Ltd. is affected on the T8100, T9100 and UDX710 models. Improper validation of scheduling information in SIB1 messages causes a stack-based buffer overflow (CWE-121). A remote attacker can achieve remote code execution or denial of service without additional execution privileges.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00455 39th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
GoogleModemT8100; T9100; UDX710—No fix listedCNA
  • Modem VendorGoogle Affected T8100; T9100; UDX710 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Modem.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-66086
  2. 2026-10-12 Alias added: GHSA-x9v2-w4w8-7v7g
  3. 2026-10-12 Priority changed: MEDIUM → LOW
  4. 2026-10-16 CISA SSVC decision points changed
  5. 2026-10-16 Priority changed: LOW → MEDIUM

References

Other 1

  • TI-2025-09686 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-07390 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.6
  • TI-2024-04898 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.6
  • TI-2024-04600 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.6
  • TI-2024-04346 Use after free in Google Chrome KEVCVSS 3.1CRITICAL 9.6
  • TI-2023-05824 Integer overflow in Google Chrome KEVCVSS 3.1CRITICAL 9.6
See all 17247 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences