CVE-2022-20592 in Android
Summary
by MITRE • 12/16/2022
In ppmp_validate_secbuf of drm_fw.c, there is a possible information disclosure due to improper input validation. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-238976908References: N/A
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Analysis
by VulDB Data Team • 04/22/2026
The vulnerability identified as CVE-2022-20592 resides within the drm_fw.c file of the Android kernel, specifically within the ppmp_validate_secbuf function. This flaw represents a critical information disclosure issue that stems from inadequate input validation mechanisms. The vulnerability affects the Android kernel implementation and has been assigned Android ID A-238976908, indicating its significance within the Android security framework. The nature of this vulnerability allows for local information disclosure without requiring any additional execution privileges or user interaction, making it particularly concerning for system security. The flaw demonstrates a clear breakdown in the kernel's validation processes that should normally prevent unauthorized data access.
The technical implementation of this vulnerability occurs within the ppmp_validate_secbuf function where the system fails to properly validate input parameters before processing them. This improper validation creates an opportunity for malicious actors to extract sensitive information from the system's memory or security buffers. The vulnerability manifests as a failure to adequately sanitize or verify the security buffer contents, potentially allowing attackers to access data that should remain protected. This type of information disclosure vulnerability aligns with CWE-20, which describes "Improper Input Validation" as a fundamental weakness that can lead to various security issues including information exposure. The root cause lies in the insufficient boundary checking and parameter validation that should occur before any security-sensitive operations are performed.
From an operational perspective, this vulnerability poses significant risks to Android devices as it enables local information disclosure without requiring elevated privileges or user interaction. Attackers can exploit this weakness to access sensitive kernel data, potentially including cryptographic keys, security tokens, or other confidential information stored in memory buffers. The lack of requirement for additional execution privileges means that any local user or process with basic system access could potentially leverage this vulnerability. This represents a serious concern for device security since it undermines the fundamental principle of privilege separation and data protection within the kernel environment. The vulnerability essentially creates a backdoor for information extraction that bypasses normal security controls, making it particularly dangerous for systems where kernel-level security is paramount.
Mitigation strategies for CVE-2022-20592 should focus on implementing robust input validation mechanisms within the ppmp_validate_secbuf function and related security buffer handling code. System administrators and device manufacturers should prioritize applying the latest kernel updates and security patches that address this specific validation flaw. The fix should include comprehensive boundary checking, parameter sanitization, and proper validation of all input data before processing security-sensitive operations. Organizations should also consider implementing monitoring solutions to detect potential exploitation attempts and establish baseline security configurations that minimize the attack surface. Additionally, regular security assessments and code reviews should be conducted to identify similar validation weaknesses in other kernel components. This vulnerability demonstrates the importance of following security best practices outlined in the ATT&CK framework, particularly those related to privilege escalation and information gathering techniques that attackers might use to exploit such kernel-level flaws.