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How CVE-2026-0098 Works
This vulnerability resides in the `getCallingPackageName` function within `Shared.java` on the Android platform. The core issue is a “confused deputy” flaw. In Android, the system’s `ActivityManagerService` acts as a gatekeeper, enforcing restrictions on which components can start new activities based on the calling package’s permissions and UID. The `getCallingPackageName` method is used by system services to identify the package that initiated a cross-process call (Binder transaction).
An attacker can exploit a logic error in this function. By crafting a specific Binder transaction to a system service that relies on getCallingPackageName, a malicious app can impersonate another, more privileged, app. The system service, acting as the confused deputy, mistakenly trusts the attacker-supplied package name. Consequently, the service enforces the restrictions (or lack thereof) belonging to the impersonated package, not the attacker’s.
This allows an unprivileged malicious app to bypass critical activity start restrictions. For example, it could launch sensitive, protected activities or UI elements that it normally would not have permission to start, all while pretending to be a trusted system component or a different app. The vulnerability leads to local escalation of privilege (EoP), granting the attacker capabilities far exceeding their granted permissions. Crucially, exploitation requires no additional execution privileges and no user interaction, making it a highly severe local attack vector.
DailyCVE Form:
Platform: Android
Version: unspecified
Vulnerability : confused deputy
Severity: Critical
date: 2026-06-02
Prediction: 2026-06-16
What Undercode Say:
Undercode's analysis confirms the confused deputy in Shared.java The attack surface is the Binder transaction path Commands to identify the vulnerable code (conceptual): grep -r "getCallingPackageName" ./Shared.java Check for missing or insufficient permission checks Log analysis to detect exploitation: adb logcat | grep -E "ActivityManager|START|Binder"
Exploit:
A malicious app with no privileges can create a Binder transaction calling `getCallingPackageName` on a target system service. By manipulating the transaction’s identity, the vulnerable method returns the package name of a privileged app (e.g., system UI). The service then grants the malicious app the activity-starting privileges of that privileged app, bypassing all restrictions.
Protection:
Apply security updates as soon as they are released by Google (expected mid-June 2026). Until then, avoid installing untrusted apps and consider using application firewalls or behavior analysis tools to monitor for unusual Binder transaction patterns.
Impact:
Successful exploitation allows an unprivileged malicious app to launch any protected activity, potentially leading to theft of sensitive data, control of system UI components, or full device compromise by chaining with other vulnerabilities.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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