CVE-2026-0200 Overview
CVE-2026-0200 is a heap-based buffer overflow [CWE-122] in a Cellular Modem component that allows an out-of-bounds write. An attacker can leverage the flaw to achieve remote escalation of privilege without additional execution privileges. Exploitation requires no user interaction, which increases exposure across affected mobile devices.
The issue was published in the Android Security Bulletin for September 2026. The advisory lists the flaw as network-exploitable and impacts the confidentiality, integrity, and availability of the target device.
Critical Impact
Remote attackers can trigger a heap overflow in the cellular modem stack and escalate privileges without user interaction, potentially compromising baseband and application processor boundaries.
Affected Products
- Android devices incorporating the affected Cellular Modem component
- Pixel devices covered by the September 2026 Android Security Bulletin
- OEM Android builds derived from the September 2026 patch level
Discovery Timeline
- 2026-09-15 - CVE-2026-0200 published to NVD
- 2026-09-16 - Last updated in NVD database
Technical Details for CVE-2026-0200
Vulnerability Analysis
The vulnerability is a heap buffer overflow [CWE-122] within the Cellular Modem component. Improper bounds enforcement during processing of cellular protocol data allows an out-of-bounds write beyond an allocated heap buffer. The corrupted heap state can be steered to overwrite adjacent objects and control-flow structures.
Because the modem processes untrusted radio-layer input, exploitation can proceed over the network path. Successful exploitation elevates attacker privileges within the modem context and can pivot toward higher-privileged code paths on the device.
Root Cause
The defect stems from insufficient validation of the length or structure of externally supplied data before it is copied into a heap-allocated buffer. When the incoming payload exceeds the expected size, the write crosses the buffer boundary and corrupts adjacent heap metadata or object fields. Refer to the Android Security Bulletin September 2026 for component-level detail.
Attack Vector
The attack vector is network based and does not require user interaction. An attacker able to deliver crafted cellular signaling or data to a target device can trigger the overflow. The advisory characterizes the outcome as remote escalation of privilege with no additional execution privileges required.
No public proof-of-concept or exploit code is available for CVE-2026-0200 at the time of publication. The vulnerability mechanism is described in the vendor advisory rather than reproduced here.
Detection Methods for CVE-2026-0200
Indicators of Compromise
- Unexpected modem service crashes, resets, or repeated baseband restarts on affected devices
- Kernel or rild log entries referencing heap corruption or aborts in cellular subsystem processes
- Anomalous cellular connectivity loss correlated with device instability across a fleet
Detection Strategies
- Compare device build fingerprints against the September 2026 Android security patch level to identify unpatched endpoints
- Alert on repeated modem or baseband process crashes captured through mobile telemetry
- Correlate device-side crash reports with mobile threat defense telemetry to surface exploitation attempts
Monitoring Recommendations
- Ingest mobile device management (MDM) compliance events into a centralized data lake for patch-level auditing
- Monitor cellular subsystem crash rates and treat statistically significant increases as investigative signals
- Track advisories referenced in the Android Security Bulletin September 2026 for related fixes and revisions
How to Mitigate CVE-2026-0200
Immediate Actions Required
- Apply the September 2026 Android security patch level or later to all affected devices
- Prioritize patch deployment for devices operating on untrusted or public cellular networks
- Enforce MDM policies that block enrollment or corporate access for devices below the required patch level
Patch Information
The fix is delivered through the September 2026 Android Security Bulletin. Device manufacturers must integrate the patched Cellular Modem component and ship the update to end users. Consult the Android Security Bulletin September 2026 for the authoritative patch reference and affected component list.
Workarounds
- No vendor-supplied workaround is documented; patching is the required remediation
- Reduce exposure by limiting use of affected devices on untrusted cellular networks until updates are applied
- Where operationally acceptable, disable cellular radios on unpatched devices and rely on managed Wi-Fi
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
