CVE-2022-20575 in Android
Summary
by MITRE • 12/16/2022
In read_ppmpu_info of drm_fw.c, there is a possible out of bounds read due to an incorrect bounds check. 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-237585040References: N/A
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 04/22/2026
The vulnerability identified as CVE-2022-20575 resides within the Android kernel's graphics subsystem, specifically in the drm_fw.c file where the read_ppmpu_info function handles firmware information processing. This issue represents a classic out-of-bounds read vulnerability that occurs when the kernel fails to properly validate array boundaries during firmware data processing operations. The flaw manifests when the system attempts to read memory locations beyond the allocated buffer boundaries, potentially exposing sensitive kernel memory contents to unauthorized access.
The technical root cause of this vulnerability stems from an incorrect bounds check implementation within the firmware reading function. When processing graphics firmware data, the system performs insufficient validation of buffer limits, allowing an attacker to manipulate input parameters that control memory access operations. This improper validation creates a condition where memory addresses beyond the intended buffer boundaries can be accessed and read, potentially revealing kernel memory contents including sensitive data structures, pointers, and other confidential information. The vulnerability operates at the kernel level, making it particularly dangerous as it can expose system internals that should remain protected from user-space access.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with insights into the kernel memory layout and internal data structures. An attacker with local access can exploit this condition to gather sensitive information that could aid in subsequent exploitation attempts, including potential privilege escalation or bypass of security mechanisms. Since no additional execution privileges are required and user interaction is not necessary for exploitation, the vulnerability represents a low-effort, high-impact threat vector. The disclosure of kernel memory contents can reveal information about memory management structures, firmware loading procedures, and other system internals that may be leveraged to craft more sophisticated attacks.
The vulnerability aligns with CWE-129, which addresses improper validation of array indices, and can be categorized under ATT&CK technique T1003.002 for OS credential dumping and T1059.001 for command and scripting interpreter. This classification reflects the potential for information gathering that could support further attacks, as attackers can use the disclosed information to understand system behavior and identify additional attack vectors. The lack of user interaction requirements makes this vulnerability particularly concerning as it can be exploited automatically without requiring social engineering or user engagement.
Mitigation strategies for CVE-2022-20575 should focus on implementing proper bounds checking within the firmware reading functions and ensuring that all buffer access operations include comprehensive validation of array indices. System administrators should prioritize applying the latest kernel security patches and updates from Android vendors to address this vulnerability. Additional protective measures include implementing kernel memory protection mechanisms such as stack canaries and address space layout randomization to make exploitation more difficult. Regular security audits of kernel code should be conducted to identify similar bounds checking issues, and input validation should be strengthened throughout the graphics subsystem to prevent similar vulnerabilities from emerging in the future.