CVE-2026-0095: Google Android Privilege Escalation Flaw

CVE-2026-0095 Overview

CVE-2026-0095 is an integer overflow vulnerability in the l2c_fcr_clone_buf function of l2c_fcr.cc, part of the Android Bluetooth stack. The flaw allows an adjacent network attacker to trigger controlled heap corruption inside the privileged Bluetooth process. Successful exploitation leads to local privilege escalation without requiring additional execution privileges or user interaction. Google addressed the issue in the Android Security Bulletin June 2026. The vulnerability affects Android 14, 15, and 16, including multiple Android 16 QPR2 beta builds.

Critical Impact

An attacker within Bluetooth range can corrupt heap memory in the privileged Bluetooth process and escalate to elevated privileges on the device without user interaction.

Affected Products

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

Discovery Timeline

• 2026-06-01 - Google releases security patch in the Android Security Bulletin
• 2026-06-01 - CVE-2026-0095 published to NVD
• 2026-06-03 - Last updated in NVD database

Technical Details for CVE-2026-0095

Vulnerability Analysis

The defect resides in l2c_fcr_clone_buf, a helper in the Android Bluetooth L2CAP Flow Control and Retransmission (FCR) module. The function clones a buffer used during L2CAP segmentation and reassembly. An integer overflow [CWE-190] in size arithmetic produces a smaller-than-expected allocation, after which a larger amount of attacker-controlled data is copied into the undersized heap buffer. The result is a controlled heap corruption inside the Bluetooth daemon, which runs with elevated privileges on Android. Because L2CAP packets are processed before any user prompt, exploitation requires no user interaction.

Root Cause

The root cause is unchecked size arithmetic when computing the length of a cloned L2CAP buffer. When length fields supplied through an attacker-controlled packet are combined with header offsets, the calculation wraps around the unsigned integer boundary. The wrapped value is then used to allocate a heap region, while the original (larger) length is used to drive the subsequent copy operation.

Attack Vector

Exploitation requires the attacker to be on the adjacent network — within Bluetooth radio range of a target with Bluetooth enabled. The attacker sends crafted L2CAP frames containing length values that trigger the overflow. Low privileges are required, consistent with the ability to initiate a Bluetooth pairing or connection session. Once the heap is corrupted in the Bluetooth process, an attacker can pivot to code execution at the privilege level of the Bluetooth daemon, achieving local privilege escalation on the device. No verified public proof-of-concept is currently available. See the Android Security Bulletin June 2026 for vendor technical details.

Detection Methods for CVE-2026-0095

Indicators of Compromise

• Unexpected crashes, restarts, or tombstones generated by the Android Bluetooth process (com.android.bluetooth) recorded in device logs.
• Anomalous L2CAP frames with inconsistent length fields captured during Bluetooth packet inspection (HCI snoop logs).
• Repeated Bluetooth pairing or connection attempts from unknown peers in proximity to managed mobile devices.

Detection Strategies

• Collect and review Android bugreport and HCI snoop logs from managed devices for repeated Bluetooth daemon crashes correlated with peer activity.
• Apply mobile threat defense rules that flag native crashes in privileged system processes following Bluetooth traffic.
• Use enterprise mobility management (EMM) reporting to detect devices running Android 14, 15, or 16 builds without the June 2026 security patch level.

Monitoring Recommendations

• Track the Android security patch level reported by each enrolled device and alert when it predates 2026-06-01.
• Monitor for unusual Bluetooth activity in environments where Bluetooth is not operationally required.
• Forward mobile device logs into a centralized analytics platform for correlation with proximity-based threat patterns.

How to Mitigate CVE-2026-0095

Immediate Actions Required

• Apply the June 2026 Android security patch level (2026-06-01 or later) to all affected Android 14, 15, and 16 devices.
• Disable Bluetooth on devices that cannot be patched immediately, particularly in high-risk or public environments.
• Inventory managed devices to identify those running unsupported Android versions or vendor builds without the June 2026 patch.

Patch Information

Google published the fix in the Android Security Bulletin June 2026. Device manufacturers (OEMs) integrate the patch into vendor-specific builds, so administrators should confirm the security patch level under Settings → About phone → Android security update on each device or via their EMM console.

Workarounds

• Turn Bluetooth off when not required, especially in untrusted radio environments such as conferences, transit, and public venues.
• Set Bluetooth visibility to non-discoverable and remove unused paired devices to reduce exposure.
• Enforce EMM policies that restrict Bluetooth usage on devices that have not received the June 2026 patch.

# Check the Android security patch level on a connected device via adb
adb shell getprop ro.build.version.security_patch
# Expected output for patched devices: 2026-06-01 or later