CVE-2026-81310 in Image Scanner Driver
Summary
by MITRE • 09/30/2026
Image Scanner Driver for Linux contains a link following vulnerability. An attacker who can log in to a Linux system where the product is installed may overwrite arbitrary files by using a special method in advance.
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Analysis
by VulDB Data Team • 09/30/2026
The identified vulnerability resides within the Image Scanner Driver software for Linux, specifically manifesting as an insecure direct object reference or path traversal flaw that allows for unauthorized file overwrites through symbolic link following attacks. This type of security defect typically arises when the application constructs file paths based on user-supplied input without adequately validating whether those inputs resolve to intended directories or files. In this specific instance, the driver fails to properly sanitize directory names or file paths provided during scanning operations or configuration updates. By exploiting this lack of validation, an attacker who has already gained valid authentication credentials on the target Linux system can manipulate these inputs to point towards sensitive system locations outside the expected scope of the application's working directory.
The technical mechanism behind this exploitation relies on the creation of a symbolic link that points to a critical file or directory within the operating system. When the vulnerable component attempts to write data, such as scanned image metadata or temporary files, it follows the symbolic link rather than writing to the intended location. This behavior is rooted in how many Unix-like systems handle filesystem operations by default, where following symlinks can lead to writes occurring anywhere on the disk if not explicitly restricted by security policies like chroot environments or strict path canonicalization checks within the application code itself. The attacker pre-creates this symbolic link with specific permissions and targets a high-value file, such as /etc/passwd, a configuration file for system services, or even executable binaries located in standard PATH directories.
The operational impact of this vulnerability is severe due to its potential for privilege escalation and complete system compromise. Although the initial requirement is that an attacker must have valid login access, which limits the attack surface compared to remote code execution flaws, it still poses a significant threat within multi-user environments or shared hosting scenarios where one user might attempt to escalate privileges by compromising another user's account or modifying core system configurations. By overwriting arbitrary files, the attacker can inject malicious scripts into startup sequences, alter authentication mechanisms, or corrupt critical application data. This effectively allows for persistent access and control over the compromised host, undermining the integrity of both the operating system and any security controls that rely on file consistency.
From a classification perspective, this vulnerability aligns with CWE-59: Improper Link Resolution Before File Access, which describes situations where an application uses symbolic links to bypass intended restrictions or perform unauthorized actions. It also relates closely to CWE-22: Improper Limitation of a Pathname to a Restricted Directory, as the core issue is the failure to restrict file operations to a specific safe directory. In terms of offensive security frameworks, this technique corresponds to ATT&CK tactic T1059: Command and Scripting Interpreter or more specifically techniques involving filesystem manipulation such as T1222: File and Directory Permissions Modification if used for persistence, though primarily it represents an integrity violation allowing lateral movement within the local system context.
Mitigation strategies should focus on implementing strict input validation and enforcing secure coding practices regarding file path handling. Developers must ensure that all user-supplied paths are canonicalized before use to prevent directory traversal sequences or symbolic link exploitation. Implementing a chroot jail for the scanner driver process can significantly reduce the blast radius by isolating it from sensitive system areas. Additionally, applying principle of least privilege ensures that even if an attacker exploits this flaw, they lack the necessary permissions to overwrite critical files unless those specific write privileges are explicitly granted. Regular security audits and static code analysis tools configured to detect unsafe file operations should be employed during development to identify such path resolution flaws early in the software lifecycle.