Researchers Exposed Tracking Flaws in 5G Networks
A new tool revealed that predictable identifier assignments allow for tracking of 5G mobile subscribers.
Updated on Sept. 22, 2026 in Telecommunications
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Researchers have developed a tool called 5G-Shark that tracks mobile subscribers by exploiting predictable temporary identifier assignments. The method forces phones to connect to fake base stations and can push devices into insecure states.
Why it matters
The vulnerability exists because certain network operators use sequential rather than random patterns for temporary identifiers, making it easy to link re-registrations. Additionally, 5G standards require phones to process unauthenticated signals before a secure connection is established.
The 5G-Shark tool uses open-source software and software-defined radio to capture 3,742 temporary identifiers. Tests involving seven devices showed that vulnerable networks assign identifiers with only 0.11 percent range advancement.
The players
IEEE
The Institute of Electrical and Electronics Engineers is a professional association that serves as a leading organization for the advancement of technology and standards.
Samsung
Samsung is a global technology conglomerate and a leading manufacturer of smartphones, including the Galaxy S23 series.
The details
By broadcasting high-priority fake cell signals, the 5G-Shark tool triggers cell reselection and forces phones to communicate with unauthorized base stations. It further exploits modem firmware by sending unauthenticated rejection messages that can trap devices in infinite retry loops or force them to downgrade to 3G connectivity.
Timeline
September 22, 2026: The research findings were published.
The Tech Race
This vulnerability highlights a critical struggle in telecommunications between optimizing network efficiency and maintaining rigorous security standards. As 5G replaces older 3G and 4G legacy systems, the industry must address flaws that allow malicious actors to exploit inherent protocol design choices.
Mobile users may face temporary service interruptions or involuntary downgrades to slower 3G network speeds if targeted by this tool. While the research highlights potential privacy risks, current impacts are primarily limited to specialized security testing environments.
The takeaway
Network operators can significantly mitigate this tracking threat by ensuring temporary identifiers are assigned with high-range variance. Consumers should remain aware that modem firmware updates and network-side configuration changes are necessary to patch these protocol-level weaknesses.
Further reading
Explore the current landscape of mobile infrastructure in the Telecommunications section.
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