CVE-2026-102730 in ThreadX
Summary
by MITRE • 09/29/2026
Mounting an attacker-controlled NAND flash image (`lx_nand_flash_open()`) triggers an unbounded out-of-bounds heap **write** in LevelX's NAND flash-translation-layer metadata parser that overwrites a driver function pointer in the control block, giving a demonstrated control-flow hijack — RIP set to a full 8-byte attacker-chosen value (register-verified). Two accompanying OOB reads. All reproduced verbatim under ASan at HEAD `9f1cfdc`. (The affected metadata-parser header states "Some portions generated by Copilot (Sonnet 4.6)" — an AI-generated parser with an unchecked on-flash count.)
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Analysis
by VulDB Data Team • 09/30/2026
The vulnerability identified in the LevelX NAND flash translation layer represents a critical memory safety failure rooted in insufficient input validation during the initialization of external storage devices. When the function lx_nand_flash_open is invoked to mount an attacker-controlled NAND flash image, the system processes metadata headers that dictate how data structures are laid out in memory. The core technical flaw lies within this metadata parser, which appears to be partially generated by artificial intelligence tools and lacks rigorous boundary checks for array indices or structure offsets derived from untrusted on-flash counts. This oversight allows an attacker who controls the contents of the NAND flash image to specify values that exceed the allocated bounds of internal data structures, leading directly to heap-based buffer overflows.
The primary impact of this flaw is an unbounded out-of-bounds write operation targeting the control block associated with the NAND driver. Specifically, by manipulating specific fields within the metadata header, a malicious actor can cause the parser to write beyond the intended memory boundaries and overwrite critical function pointers stored within the device's control structure. This corruption transforms what would typically be a denial of service or data integrity issue into a severe code execution vulnerability. The overwritten pointer serves as a direct conduit for control-flow hijacking, allowing the attacker to redirect program execution flow away from legitimate system routines.
The severity of this exploitation vector is significantly amplified by the precision with which the attack can be executed. Evidence indicates that the resulting instruction pointer manipulation allows for setting the RIP register to a full eight-byte value chosen entirely by the attacker and verified through registers during runtime analysis using AddressSanitizer. This level of control suggests that standard return-oriented programming mitigations or stack canaries may not provide adequate protection, as the attacker gains direct write access to memory locations governing execution flow without relying on complex gadget chains. The presence of two accompanying out-of-bounds reads further indicates a broader pattern of unsafe memory access within this parser module, suggesting that other fields in the control block are also susceptible to corruption or information disclosure.
From a classification perspective, this vulnerability aligns with CWE-787: Out-of-bounds Write and CWE-94: Improper Control of Generation of Code (Code Injection), particularly given the AI-generated nature of the parser which likely lacked human-reviewed security constraints. In terms of attack behavior, it maps to MITRE ATT&CK techniques involving memory corruption for privilege escalation or lateral movement, specifically leveraging improper input validation to achieve arbitrary code execution. The fact that this was reproduced verbatim under AddressSanitizer at a specific commit head confirms that the issue is reproducible and not dependent on undefined behavior variations across different compiler optimizations or runtime environments.
Mitigation strategies must focus on immediate remediation of the metadata parsing logic within LevelX's NAND flash translation layer. Developers should implement strict bounds checking for all indices, offsets, and count values derived from external storage headers before they are used to access memory structures. It is crucial to validate that any value read from the NAND image does not exceed the maximum allowable size of the corresponding internal data structure or control block. Additionally, employing compiler-based protections such as stack canaries, Control Flow Integrity (CFI), and full RELRO where applicable can provide defense-in-depth layers against exploitation attempts while longer-term fixes are deployed. Future development processes should enforce rigorous code review standards for any auto-generated code segments to ensure that security constraints are explicitly defined rather than assumed by the generation tool.