CVE-2026-28668 in Android
Summary
by MITRE • 09/08/2026
In LimitRealloc of malloc_limit.cpp, there is a possible use after free due to a logic error in the code. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified within the limitReallocation function of malloc_limit.cpp represents a critical memory safety flaw classified as a use-after-free condition resulting from a logic error in dynamic memory management routines. This specific implementation detail suggests that the allocator fails to properly invalidate or update pointers after freeing associated memory blocks, leaving dangling references active within the application state. Such errors are fundamentally rooted in improper handling of resource lifecycles where the program continues to operate on memory addresses that have been returned to the system for reuse by other processes or subsequent allocation requests. This type of flaw is formally categorized under CWE-416 which denotes use after free, a category of vulnerabilities often exploited through carefully crafted inputs designed to trigger specific code paths that bypass standard safety checks during deallocation sequences.
From an operational perspective, this vulnerability allows for local privilege escalation without requiring any additional execution privileges from the attacker or necessitating user interaction. The absence of required user engagement significantly lowers the barrier for exploitation, enabling a malicious actor with basic access to the system to execute arbitrary code by manipulating heap structures. By controlling the contents of reallocated memory through subsequent allocation calls before the dangling pointer is accessed again, an attacker can achieve control over program execution flow. This capability typically leads to full compromise of the affected process and potentially the underlying operating system depending on the security context in which the vulnerable application runs. The attack vector aligns with ATT&CK techniques related to privilege escalation such as T1068 exploitation for privilege escalation, where attackers leverage software vulnerabilities to gain higher-level access than originally granted.
The technical mechanism likely involves a scenario where an object is freed but its pointer remains stored in a data structure or variable that is later dereferenced during normal operation. Because the memory has been reallocated, the attacker can inject malicious payloads into this newly allocated space which will then be interpreted as valid code or data by the original context holding the stale reference. This misinterpretation allows for arbitrary read and write operations within the process address space, facilitating stack pivoting, return-oriented programming attacks, or direct shellcode execution. The severity is compounded by the fact that no special privileges are needed to trigger the initial conditions leading up to the use-after-free state, making it a high-risk vulnerability in environments where untrusted input can influence memory allocation patterns.
Mitigation strategies must focus on rigorous code review and implementation of robust memory management practices. Developers should ensure that all pointers are explicitly set to null immediately after freeing associated memory blocks to prevent accidental dereferencing. Implementing defensive programming techniques such as using smart pointers or container classes that manage lifecycles automatically can significantly reduce the risk of such logic errors. Additionally, employing static analysis tools and dynamic testing frameworks like AddressSanitizer during development phases helps identify these issues early in the software lifecycle. For deployed systems, applying vendor-provided patches is essential to resolve the underlying code defect. System administrators should also enforce least privilege principles for applications requiring complex memory management operations to limit the potential impact of successful exploitation attempts.