Description

In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is needed for exploitation. Patch ID: MOLY01898195; Issue ID: MSV-8906.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-10-05T02:16:51.283Z",
  "pubdate": "2026-10-05T02:16:51.283Z",
  "executiveSummary": "This vulnerability involves an out-of-bounds (OOB) write condition within the Modem firmware, triggered by an insufficient bounds checking mechanism during data processing.\nThe flaw allows a remote attacker to achieve escalation of privilege by emulating a rogue base station.\nSuccessful exploitation compromises the integrity and confidentiality of the affected User Equipment (UE).\nWhile the vulnerability facilitates remote escalation without pre-existing execution privileges, the exploit process requires specific user interaction.\nThe vulnerability is tracked under Issue ID: MSV-8906 and associated with Patch ID: MOLY01898195.\nThe risk is significant due to the potential for baseband-level compromise, which operates at a high privilege level within the mobile device architecture.",
  "technicalDetails": "The root cause of this vulnerability is a failure in the Modem firmware's input validation logic, specifically a missing bounds check when processing data received from a network entity.\nWhen a UE connects to an attacker-controlled rogue base station, the station transmits maliciously crafted radio resource control (RRC) or non-access stratum (NAS) signaling packets.\nDue to the missing bounds check, the Modem firmware writes these packets into memory regions outside the intended buffer allocation, leading to an OOB write condition.\nThis behavior potentially allows an attacker to overwrite critical data structures, control flow registers, or function pointers within the Modem's memory space.\nThe exploit flow begins with the victim's device performing a cell selection or reselection process, leading it to attach to the rogue base station broadcasting the malicious signal.\nUpon establishing a connection, the rogue base station sends a specifically structured packet designed to trigger the out-of-bounds write.\nAlthough the vulnerability is classified as a remote escalation of privilege, the requirement for user interaction suggests that the device must be in a state where a connection or data exchange is initiated or facilitated by the end-user.\nBy overwriting memory, an attacker may achieve arbitrary code execution within the context of the Modem processor, which typically operates with high privileges, bypassing traditional application-layer sandboxing.\nBecause the Modem handles low-level radio communication, a successful compromise provides the attacker with persistent access to network traffic, the ability to intercept sensitive communications, or the capability to further compromise the application processor (AP) via inter-processor communication (IPC) channels.\nThe vulnerability effectively bypasses standard memory protection mechanisms within the Modem environment, as the lack of proper validation allows the firmware to treat untrusted network input as safe to process."
}