CVE-2026-0030: Google Android Privilege Escalation Flaw

CVE-2026-0030 Overview

CVE-2026-0030 is a local privilege escalation vulnerability affecting the Android kernel's memory protection subsystem. The vulnerability exists in the __host_check_page_state_range function within mem_protect.c, where an incorrect bounds check allows an attacker to perform an out-of-bounds write operation. This flaw can be exploited to achieve local escalation of privilege without requiring additional execution privileges or user interaction.

Critical Impact

This vulnerability enables local privilege escalation on Android devices, potentially allowing malicious applications to gain elevated system privileges and compromise device security without any user interaction.

Affected Products

• Google Android (all versions prior to March 2026 security patch)

Discovery Timeline

• 2026-03-02 - CVE-2026-0030 published to NVD
• 2026-03-03 - Last updated in NVD database

Technical Details for CVE-2026-0030

Vulnerability Analysis

The vulnerability resides in the __host_check_page_state_range function in the Android kernel's memory protection component (mem_protect.c). This function is responsible for validating page state ranges during memory operations. The flaw stems from an improper bounds check that fails to correctly validate the range boundaries before performing write operations.

When the bounds check fails to properly validate input parameters, an attacker can craft specific memory operations that write data beyond the intended buffer boundaries. This out-of-bounds write condition (CWE-787) can corrupt adjacent memory structures, potentially allowing an attacker to manipulate kernel data structures or inject malicious code into privileged memory regions.

The local attack vector means an attacker must already have code execution capabilities on the target Android device, typically through a malicious application. However, once this initial foothold is established, the vulnerability can be exploited without requiring any additional privileges or user interaction, making it particularly dangerous for devices with untrusted applications installed.

Root Cause

The root cause of CVE-2026-0030 is an incorrect bounds check implementation in the __host_check_page_state_range function. The function fails to properly validate the upper boundary of the page state range before performing memory write operations. This allows memory operations to exceed the allocated buffer, resulting in an out-of-bounds write condition that can corrupt adjacent kernel memory structures.

Attack Vector

This vulnerability requires local access to the target Android device. An attacker can exploit this flaw through a malicious application that triggers the vulnerable code path in mem_protect.c. The attack does not require any special privileges beyond the ability to execute code on the device, and no user interaction is necessary for successful exploitation. Once exploited, the attacker can achieve privilege escalation, potentially gaining root-level access to the device and bypassing Android's security sandbox mechanisms.

The vulnerability mechanism involves crafting specific memory page state operations that trigger the incorrect bounds check. When these operations are processed by the kernel, the out-of-bounds write allows the attacker to overwrite critical kernel data structures. For detailed technical information about the patch implementation, refer to the Android Kernel Commits published by Google.

Detection Methods for CVE-2026-0030

Indicators of Compromise

• Unexpected privilege escalation events from unprivileged applications
• Kernel crash logs or panic events related to memory protection subsystem operations
• Anomalous memory access patterns in kernel logs involving mem_protect.c functions
• Suspicious applications attempting to trigger memory page state operations at high frequency

Detection Strategies

• Monitor for unusual kernel log entries related to memory protection violations or page state errors
• Implement application behavior analysis to detect privilege escalation attempts from untrusted applications
• Deploy endpoint detection solutions capable of identifying kernel-level exploitation attempts
• Review device logs for unexpected crashes or restarts that may indicate exploitation attempts

Monitoring Recommendations

• Enable verbose kernel logging on Android devices in development or security testing environments
• Implement Security Information and Event Management (SIEM) rules to alert on privilege escalation patterns
• Monitor application installation sources and verify application signatures to reduce malicious app risk
• Regularly audit device security posture and check for unpatched kernel vulnerabilities

How to Mitigate CVE-2026-0030

Immediate Actions Required

• Apply the March 2026 Android Security Patch immediately on all affected devices
• Review installed applications and remove any untrusted or unnecessary applications
• Enable Google Play Protect to detect potentially harmful applications
• Consider restricting application installation sources to trusted repositories only

Patch Information

Google has addressed this vulnerability in the March 2026 Android Security Bulletin. Multiple kernel commits have been released to fix the bounds check issue in mem_protect.c:

• Kernel Commit 986614312222d4b3bdcf16840cdb4abdaed8a42d
• Kernel Commit aff2255dbe38dc7c57bac8d3ba9feed989289b20
• Kernel Commit f3a4b4d4a1fe2aface7de74ac257b8705b6de472

For complete details, refer to the Android Security Bulletin March 2026.

Workarounds

• Limit application installation to trusted sources only (Google Play Store or verified enterprise repositories)
• Remove or disable any applications that are not essential until patching is complete
• Enable Android's Verify Apps feature to scan installed applications for harmful behavior
• For enterprise environments, use Mobile Device Management (MDM) solutions to enforce security policies and restrict untrusted application execution

# Verify Android security patch level on device
adb shell getprop ro.build.version.security_patch
# Expected output should be 2026-03-01 or later to be protected against CVE-2026-0030