CVE-2026-0100: Android Heap Buffer Overflow Local Privilege Escalation

Technical summary

CVE-2026-0100 is a heap buffer overflow (CWE-122) in the Android resource archive loading mechanism. The vulnerability occurs during the processing of compiled Android resource files, where insufficient bounds checking permits an attacker to write past allocated heap memory. Since the flaw requires only local access and standard user privileges, any application running on the device can potentially trigger the condition. The out-of-bounds write corrupts adjacent heap structures, enabling privilege escalation to higher system contexts.

Business impact

Organizations deploying Android devices face significant risk if this vulnerability is not patched. Attackers can gain device administrator or system-level access without user awareness, leading to complete device compromise. This threatens corporate mobile device management (MDM) policies, sensitive data theft from enterprise applications, lateral movement within corporate networks, and potential compliance violations if regulated data is exposed. The lack of a required exploit condition (no special permissions, no user interaction) makes this particularly dangerous in BYOD and managed device environments.

Affected systems

Google Android devices across multiple versions are affected by this vulnerability. The exact list of affected Android versions and patch timelines should be verified against Google's official Android Security & Privacy Year in Review and monthly security bulletins, as the source data does not specify version ranges. Organizations should prioritize inventory of Android device versions currently deployed and cross-reference against Android security advisories to identify exposure.

Exploitability

This vulnerability presents a high exploitability profile. An attacker needs only local code execution capability, which is trivial to achieve—any installed application or process running under a standard user account can trigger the buffer overflow. Since no elevated privileges or user interaction is required, exploitation can occur silently in the background. The simplicity of the attack surface (local access + standard privileges) combined with the high-impact outcome (privilege escalation) makes this a prime target for malicious apps, supply-chain compromised applications, or privilege escalation chains in multi-stage attacks.

Remediation

Apply the official Android security patch when released by Google. Device manufacturers and carriers may release patches at varying timelines; consult your device's security update schedule. Until patches are available, mitigate exposure by restricting installation of third-party applications from untrusted sources, enforcing strict app permission policies via MDM tools, and disabling sideloading if possible. Organizations with high-risk devices should consider temporary restrictions on sensitive operations or heightened monitoring for suspicious privilege escalation activity.

Patch guidance

Monitor Google's Android Security & Privacy website and your device manufacturer's security bulletins for official patch releases. Patches will be integrated into monthly Android security updates. Organizations should establish a patching timeline based on device criticality—prioritize enterprise-managed devices and those handling sensitive data. Verify patch deployment through device inventory systems or MDM solutions to confirm all vulnerable devices have been updated. Note: Specific patch version numbers should be verified against the official Android security advisory once released.

Detection guidance

Monitor for suspicious process behavior indicative of local privilege escalation attempts, such as processes attempting to access system-level resources or unexpected capability acquisitions. Look for crashes or exceptions in system_server or init processes that might indicate heap corruption. Endpoint detection and response (EDR) tools can flag privilege escalation syscalls (e.g., setuid, setgid variants) originating from non-system processes. Collect forensic evidence from any affected device, including kernel logs and crash dumps, to identify whether the vulnerability was exploited.

Why prioritize this

This vulnerability merits immediate prioritization due to its HIGH CVSS 3.1 score of 7.8, driven by local privilege escalation with no execution barriers, high impact across confidentiality, integrity, and availability, and the universal nature of Android deployments. The absence of required user interaction and special privileges means exploitation can occur silently. In environments with strict security postures, this represents one of the most direct paths to device compromise and should be treated with urgency matching critical remote code execution vulnerabilities.

Risk score, explained

The CVSS 3.1 score of 7.8 (HIGH) reflects: Attack Vector (Local) requiring device access; Attack Complexity (Low) as exploitation is straightforward; Privileges Required (Low) needing only standard user context; User Interaction (None) enabling silent exploitation; Scope (Unchanged) affecting only the vulnerable Android instance; and impact across all three security objectives (Confidentiality, Integrity, Availability all High). The score accurately captures the severity of local privilege escalation without requiring special preconditions.

Frequently asked questions