CVE-2022-20568 in Android
Summary
by MITRE • 12/16/2022
In (TBD) of (TBD), there is a possible way to corrupt kernel memory due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-220738351References: Upstream kernel
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Analysis
by VulDB Data Team • 04/22/2026
This vulnerability represents a critical use after free condition within the android kernel that enables local privilege escalation without requiring additional execution privileges or user interaction for exploitation. The flaw occurs in the kernel memory management subsystem where freed memory blocks are accessed after being deallocated, creating opportunities for memory corruption that can be leveraged by malicious actors. The vulnerability is classified as a memory safety issue that directly impacts the kernel's ability to maintain secure memory boundaries and prevent unauthorized access to system resources. According to the upstream kernel references and android kernel analysis, this particular flaw demonstrates how improper memory deallocation and subsequent reuse can lead to severe security implications.
The technical implementation of this vulnerability involves the kernel's memory allocator failing to properly track memory block usage after deallocation, allowing for potential reuse of freed memory regions. When the kernel processes certain memory operations, it may continue to reference memory that has already been freed, leading to unpredictable behavior and potential code execution. This type of flaw falls under the common weakness enumeration category of CWE-416, which specifically addresses use after free conditions in memory management. The vulnerability's exploitation does not require user interaction, making it particularly dangerous as it can be triggered automatically through normal system operations or specific kernel function calls.
The operational impact of this vulnerability extends beyond simple memory corruption to enable local privilege escalation, allowing attackers with minimal privileges to gain elevated system access. This escalation occurs because the memory corruption can be manipulated to overwrite critical kernel data structures or function pointers, potentially allowing attackers to execute arbitrary code with kernel-level privileges. The vulnerability affects the android kernel specifically, which means that any device running affected android versions could be compromised through exploitation of this memory management flaw. The lack of user interaction requirement makes this vulnerability particularly concerning as it can be exploited silently in the background without user awareness.
Mitigation strategies for this vulnerability should focus on implementing proper memory management practices within the kernel, including enhanced memory tracking mechanisms and stricter validation of memory block usage. The primary solution involves applying kernel patches that address the specific memory deallocation and reuse patterns that lead to this condition. Organizations should prioritize updating their android kernel implementations to versions that contain fixes for this vulnerability, as the upstream kernel references indicate that patches are available to address the memory safety issue. Additionally, implementing runtime memory protection mechanisms such as stack canaries and memory protection boundaries can help detect and prevent exploitation attempts. The vulnerability's classification under ATT&CK framework would likely map to privilege escalation techniques, specifically those involving kernel memory corruption and exploitation of system-level vulnerabilities.