CVE-2026-56882 Overview
CVE-2026-56882 is a high-severity vulnerability in the Cellular Modem component addressed in the Android Security Bulletin for September 2026. A logic error in the modem code allows information disclosure that can escalate to remote code execution. Exploitation requires no user interaction and no additional execution privileges. The flaw is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor. Attackers with network reachability to the affected modem stack can leverage the disclosed information to achieve code execution on the target device.
Critical Impact
A network-reachable attacker can chain an information disclosure in the Cellular Modem into remote code execution without user interaction, gaining full confidentiality, integrity, and availability impact on affected devices.
Affected Products
- Android devices incorporating the affected Cellular Modem component
- Pixel devices covered by the September 2026 Android Security Bulletin
- Refer to the Android Security Bulletin September 2026 for the authoritative device and build list
Discovery Timeline
- 2026-09-15 - CVE-2026-56882 published to the National Vulnerability Database
- 2026-09-16 - Entry last updated in NVD
Technical Details for CVE-2026-56882
Vulnerability Analysis
The vulnerability resides in the Cellular Modem component processing radio-layer data. A logic error in the code path handling modem messages causes sensitive information to be exposed to an unauthorized context. That leaked information provides an attacker with the state or memory data required to construct a follow-on remote code execution primitive. Because the modem processes data received over the cellular network, the attack surface is exposed without any user action such as opening a message or accepting a connection. The advisory notes that exploitation does not require additional execution privileges beyond what the modem interface already provides.
Root Cause
The underlying defect is a logic error, tracked under CWE-200, that causes the modem to disclose information it should keep confidential. The disclosed data undermines memory safety or protocol state assumptions, enabling attacker-controlled input to be interpreted as code or trusted control data.
Attack Vector
The attack vector is network-based. An adversary within reach of the device over the cellular network delivers crafted traffic to the modem, triggers the logic error, and uses the leaked information to drive a subsequent code execution stage. No user interaction is required, and exploitation proceeds without local access to the handset.
No public proof-of-concept code is available for CVE-2026-56882. Technical specifics beyond the advisory summary have not been published. See the Android Security Bulletin September 2026 for vendor-provided detail.
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Stop Exploit AttemptsDetection Methods for CVE-2026-56882
Indicators of Compromise
- No public indicators of compromise have been released for CVE-2026-56882 at the time of publication.
- Unexpected modem crashes, resets, or radio interface layer (RIL) errors on affected builds may warrant investigation.
- Anomalous baseband firmware behavior or unexplained cellular connectivity interruptions on unpatched devices.
Detection Strategies
- Inventory mobile devices and correlate build fingerprints against the fixed builds listed in the September 2026 Android Security Bulletin.
- Use mobile device management (MDM) compliance policies to flag devices running pre-patch security patch levels.
- Monitor endpoint telemetry from mobile threat defense agents for modem instability or repeated baseband exceptions.
Monitoring Recommendations
- Track the Android security patch level reported by enrolled devices and alert on devices below the September 2026 patch level.
- Review cellular carrier and enterprise mobility logs for repeated abnormal signaling toward specific devices.
- Subscribe to updates from the Android Security Bulletin for revised device coverage.
How to Mitigate CVE-2026-56882
Immediate Actions Required
- Apply the September 2026 Android security patch level (2026-09-01 or later) to all affected devices as soon as vendor builds are available.
- Prioritize patching of high-value or executive devices that operate in high-risk cellular environments.
- Enroll unmanaged mobile devices in an MDM to enforce patch compliance and revoke access for out-of-date devices.
Patch Information
The fix is delivered through the September 2026 Android Security Bulletin. Device manufacturers ship the corresponding modem and system updates on their own cadence. Consult the Android Security Bulletin September 2026 and your device vendor's advisory for the exact build numbers that remediate CVE-2026-56882.
Workarounds
- No vendor-supplied workaround has been published; patching is the supported remediation.
- Where patching is delayed, restrict use of unpatched devices on untrusted cellular networks and consider disabling cellular radios in favor of Wi-Fi with VPN.
- Enforce conditional access policies that block enterprise resource access from devices below the September 2026 patch level.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
