CVE-2026-25302 in Auto
Summary
by MITRE • 10/06/2026
Cryptographic Issue when processing non-ELF partitions, authentication and signature checks are bypassed, allowing unsigned or corrupted images to be mounted and processed.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 10/06/2026
The vulnerability described represents a critical failure in the integrity verification mechanisms of systems that handle multiple partition types, specifically those involving non-Executable and Linkable Format (non-ELF) binaries or firmware components. In secure boot architectures and embedded system initialization processes, it is standard practice to enforce strict authentication and signature validation for all loaded images to prevent unauthorized code execution. However, in this specific scenario, the cryptographic verification logic contains a flaw that selectively ignores these checks when processing partitions that do not conform to the ELF format. This oversight creates a significant security gap where attackers can bypass mandatory integrity controls by packaging malicious payloads or corrupted data into non-ELF containers such as raw binary blobs, FAT images, ext4 filesystems, or other proprietary formats commonly used in embedded devices and IoT firmware.
From a technical perspective, this flaw aligns with CWE-327, which denotes the use of a broken or risky cryptographic algorithm, but more accurately reflects CWE-345, Insufficient Verification of Data Authenticity. The root cause lies in the conditional logic governing the image loading routine. Instead of applying uniform verification policies across all partition types, the system likely employs type-specific handlers that fail to invoke the digital signature validation module for non-standard formats. This allows an attacker who has gained limited access to the storage medium or can influence the boot process to inject unsigned code. Since the system proceeds to mount and execute these images without verifying their origin or integrity, any modifications made by a malicious actor will be accepted as legitimate.
The operational impact of this vulnerability is severe, particularly in environments where device security relies heavily on trusted execution paths such as U-Boot, GRUB, or custom embedded bootloaders. An attacker can exploit this to achieve arbitrary code execution with the privileges granted during the early stages of system initialization. This often translates to full root access, enabling the installation of persistent malware, data exfiltration, and complete compromise of the device's confidentiality and availability. In IoT contexts, this could allow an adversary to turn devices into part of a botnet or manipulate physical processes controlled by embedded systems. Furthermore, because the vulnerability affects non-ELF partitions, it may bypass traditional static analysis tools that focus primarily on executable binaries, making detection more difficult during routine security audits.
To mitigate this risk, developers must enforce uniform cryptographic verification across all partition types regardless of their format. This involves refactoring the image loading logic to ensure that signature checks are performed before any mounting or execution occurs for every supported file system type. Implementing a whitelist approach where only known-good signatures are accepted can further reduce the attack surface. Additionally, integrating hardware-backed root of trust mechanisms such as TPMs or secure elements can provide an additional layer of protection by ensuring that key management and verification occur in isolated environments. Regular security testing should include fuzzing of partition parsers to identify similar logic flaws in other format handlers. Aligning remediation efforts with MITRE ATT&CK techniques related to Bootkit execution, specifically T1542.003 or T1609, will help ensure that defensive strategies cover this specific vector of attack.