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Vulnerability Database/CVE-2026-58834

CVE-2026-58834: Google Android DOS Vulnerability

CVE-2026-58834 is a persistent denial of service flaw in Google Android's DevicePolicyManagerService that allows local attackers to disrupt device operations without privileges or user interaction. This post explains its impact, affected versions, and mitigation steps.

Published:

CVE-2026-58834 Overview

CVE-2026-58834 is an input validation flaw in the setPermissionGrantState method of DevicePolicyManagerService.java in Google Android. The defect allows a local, low-privileged caller to trigger a persistent denial of service without user interaction. The issue is tracked under CWE-20: Improper Input Validation and is addressed in the Android Security Bulletin October 2026.

Critical Impact

A local application can send crafted input to the Device Policy Manager that causes a persistent denial of service on the affected device.

Affected Products

  • Google Android 14.0
  • Google Android 15.0
  • Google Android 16.0 (including QPR2 Beta 1, Beta 2, Beta 3) and Android 17.0

Discovery Timeline

  • 2026-10-05 - CVE-2026-58834 published to the National Vulnerability Database (NVD)
  • 2026-10-07 - Last updated in NVD database

Technical Details for CVE-2026-58834

Vulnerability Analysis

The vulnerability resides in DevicePolicyManagerService.java, a core Android system service that mediates device policy configuration for enterprise and work-profile deployments. The setPermissionGrantState method configures the grant state of runtime permissions on behalf of a device or profile owner. Improper validation of input parameters allows a local caller to drive the service into a persistent faulting state.

The condition is persistent, meaning the affected device or policy surface does not recover after a single invocation. The resulting denial of service degrades device availability without granting the attacker code execution, data access, or elevated privileges.

Root Cause

The root cause is improper input validation [CWE-20] in setPermissionGrantState. The method does not sufficiently constrain inputs before applying permission grant state changes, allowing malformed or unexpected values to produce an unrecoverable error path within the service.

Attack Vector

Exploitation requires local access and low privileges on the target device. A malicious or compromised application invokes setPermissionGrantState with crafted parameters through the DevicePolicyManager interface. No user interaction is required. The vulnerability yields no confidentiality or integrity impact, only availability loss.

No verified proof-of-concept exploit code is published. Refer to the Android Security Bulletin October 2026 for component-level technical details.

Detection Methods for CVE-2026-58834

Indicators of Compromise

  • Repeated crashes or ANR (Application Not Responding) events attributed to system_server or the device_policy component in logcat output.
  • Unexpected failures of enterprise or work-profile features such as runtime permission management after installation of a non-trusted application.
  • Applications invoking DevicePolicyManager.setPermissionGrantState without a legitimate enterprise management role.

Detection Strategies

  • Monitor Android system logs for exceptions originating in DevicePolicyManagerService and correlate with the invoking package identifier (UID).
  • Use mobile threat defense telemetry to flag applications that call device policy APIs outside of an approved device owner or profile owner context.
  • Review Enterprise Mobility Management (EMM) and Mobile Device Management (MDM) consoles for devices reporting policy service failures.

Monitoring Recommendations

  • Centralize Android device logs in a security data lake and alert on recurring system_server restarts tied to the device policy subsystem.
  • Track the Android security patch level reported by managed devices and alert when devices lag the October 2026 bulletin.
  • Baseline the set of applications holding device administrator or profile owner privileges and alert on new assignments.

How to Mitigate CVE-2026-58834

Immediate Actions Required

  • Apply the October 2026 Android security patch level or later to all managed devices running Android 14, 15, 16, or 17.
  • Restrict installation of untrusted applications on devices that cannot be patched immediately, particularly those with sensitive enterprise profiles.
  • Audit which applications hold device owner or profile owner roles and remove any that are not strictly required.

Patch Information

Google addressed CVE-2026-58834 in the October 2026 Android Security Bulletin. Device vendors integrate the Android Open Source Project (AOSP) fix into their respective security patch levels. Consult the Android Security Bulletin October 2026 and the device manufacturer's advisory for build-specific availability.

Workarounds

  • Enforce an application allowlist through your MDM to block sideloading of untrusted applications until patches are deployed.
  • Disable or restrict work-profile provisioning on fleets that cannot receive the October 2026 patch, reducing the exposure of the Device Policy Manager interface.
  • Educate users to install applications only from vetted sources such as managed Google Play.
bash
# Verify the Android security patch level on a connected device
adb shell getprop ro.build.version.security_patch
# Expected output for patched devices: 2026-10-01 or later

Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.

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