CVE-2026-49937: Google Android Privilege Escalation Flaw

CVE-2026-49937 is a privilege escalation vulnerability in Google Android caused by an out of bounds read in MessageQueueBase.h. This flaw allows local attackers to gain elevated privileges without user interaction. This article covers technical details, affected versions, impact assessment, and mitigation strategies.

CVE-2026-49937 Overview

CVE-2026-49937 is an out-of-bounds read vulnerability in multiple functions of MessageQueueBase.h in Google Android. The flaw stems from an incorrect bounds check that allows a local attacker to read memory outside the intended buffer. Successful exploitation leads to local escalation of privilege without requiring additional execution privileges or user interaction. The issue affects Android versions 14, 15, 16 (including QPR2), and 17. Google addressed the vulnerability in the October 2026 Android Security Bulletin.

Critical Impact
A local attacker with low privileges can escalate privileges on affected Android devices without user interaction, compromising confidentiality, integrity, and availability.

Affected Products

Google Android 14.0
Google Android 15.0
Google Android 16.0 (including QPR2)
Google Android 17.0

Discovery Timeline

2026-10-01 - Google releases security patch in the October 2026 Android Security Bulletin
2026-10-05 - CVE-2026-49937 published to NVD
2026-10-07 - Last updated in NVD database

Technical Details for CVE-2026-49937

Vulnerability Analysis

The vulnerability resides in MessageQueueBase.h, a header-defined component used across multiple functions within the Android framework. An incorrect bounds check permits reads beyond the intended memory region. This condition is classified under [CWE-119], improper restriction of operations within the bounds of a memory buffer.

An attacker leveraging this flaw can disclose adjacent memory contents. Depending on the surrounding allocation layout, leaked data may include pointers, tokens, or state information that enables local privilege escalation. The weakness requires only local access with low privileges, making it reachable from third-party applications running under standard app sandboxing.

Root Cause

The root cause is an incorrect bounds check in multiple functions declared in MessageQueueBase.h. The validation logic fails to confirm that read indices remain within the allocated buffer length. As a result, the code accesses memory outside the queue's valid range during normal message queue operations.

Attack Vector

Exploitation requires local access to the device. A malicious application running on the device can trigger the vulnerable code path by invoking the affected message queue operations. No user interaction is required, and the attacker does not need to obtain additional execution privileges before triggering the flaw. The scope remains unchanged, but confidentiality, integrity, and availability impacts are all high.

No public proof-of-concept exploit has been published, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the Android Security Bulletin October 2026 for additional technical details.

Detection Methods for CVE-2026-49937

Indicators of Compromise

No specific indicators of compromise have been published for CVE-2026-49937.
Unexpected application crashes referencing MessageQueueBase or related IPC components in logcat output may indicate exploitation attempts.
Unauthorized privilege elevation events in system audit logs from untrusted applications warrant investigation.

Detection Strategies

Inventory enrolled Android devices and flag any running Android 14, 15, 16, or 17 that have not received the October 2026 security patch level.
Monitor mobile device management (MDM) telemetry for devices reporting pre-October 2026 patch levels.
Review installed applications for sideloaded or untrusted packages that could invoke affected message queue APIs.

Monitoring Recommendations

Enforce mobile device compliance policies that require the October 2026 Android Security Bulletin patch level.
Collect and centralize mobile device logs for anomalies tied to native crashes in system services.
Track Google Play Protect status across the fleet to ensure runtime scanning remains enabled.

How to Mitigate CVE-2026-49937

Immediate Actions Required

Apply the October 2026 Android security update (patch level 2026-10-01 or later) across all affected devices.
Prioritize patching for devices used by privileged users, developers, and administrators.
Restrict installation of applications from untrusted sources through MDM policies.

Patch Information

Google released a fix for CVE-2026-49937 in the Android Security Bulletin October 2026. Device manufacturers distribute the patch through carrier and OEM update channels. Verify the patch level under Settings → About phone → Android security update after installation.

Workarounds

No vendor-provided workarounds exist for CVE-2026-49937; applying the security patch is the only remediation.
Limit exposure by restricting third-party application installation and enforcing Google Play Protect.
Enroll devices in enterprise mobility management to enforce timely security updates.

bash

# Verify Android security patch level via ADB
adb shell getprop ro.build.version.security_patch
# Expected output for remediated devices: 2026-10-01 or later