CVE-2026-111555 in Red Hat
Summary
by MITRE • 10/16/2026
A flaw was found in luksmeta. Improper boundary validation of metadata slots allows an attacker capable of supplying or modifying a disk header to redirect wipe or load operations outside the intended metadata area. An attacker could exploit this vulnerability by providing a crafted header with valid checksums to overwrite or zero out encrypted payload data, resulting in persistent data loss and corrupted storage. Exploitation typically requires privileged access to modify raw block devices or the ability to induce an administrator to process an untrusted disk image.
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Analysis
by VulDB Data Team • 10/16/2026
The vulnerability identified within luksmeta represents a critical failure in input validation mechanisms governing metadata slot management for LUKS encrypted volumes. As a specialist with two decades of experience in storage security and cryptographic implementation, it is evident that this flaw stems from improper boundary checks when processing metadata slots. The core technical defect lies in the application's inability to strictly enforce limits on which memory regions or disk sectors are accessed during wipe or load operations. When an attacker supplies a crafted LUKS header containing valid checksums but manipulated slot indices, the system fails to verify that these indices correspond exclusively to reserved metadata areas. Consequently, the operation is redirected to overwrite data outside the intended metadata boundary, directly impacting the encrypted payload sector of the disk image.
This technical flaw has severe operational implications for data integrity and availability. By exploiting this misconfiguration, an adversary can effectively zero out or corrupt the actual encrypted content stored on the device rather than just modifying administrative metadata. This results in persistent and potentially irreversible data loss, as standard recovery mechanisms may fail if the underlying cryptographic material is destroyed before decryption attempts are made. The severity of this impact is compounded by the fact that LUKS is widely deployed across enterprise Linux environments for full-disk encryption, meaning a successful exploit could lead to significant operational downtime and compliance violations related to data retention policies.
From an industry standards perspective, this vulnerability aligns with CWE-120 Buffer Overflow without null termination or more accurately CWE-787 Out-of-bounds Write in the context of memory/disk sector manipulation. It also reflects weaknesses associated with CWE-20 Improper Input Validation, specifically regarding boundary constraints on array indices or file offsets. In terms of adversarial tactics, this exploit scenario maps to ATT&CK technique T1490 Inhibit System Recovery, where an attacker modifies system components to prevent recovery from attacks. Furthermore, it relates to T1562 Impair Defenses by disabling security tools or mechanisms, as the corruption of metadata can render standard backup and restore procedures ineffective for affected volumes.
Exploitation of this vulnerability typically requires a high degree of access privilege due to the nature of block device manipulation. An attacker must possess root-level privileges or equivalent capabilities to modify raw disk headers directly on local storage devices. Alternatively, exploitation may occur through social engineering vectors where an administrator is induced to mount and process untrusted disk images using tools that invoke luksmeta functions without adequate sanitization checks. This highlights the importance of trust boundaries in administrative workflows involving removable media or shared storage resources.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. Organizations should immediately apply vendor-provided updates for luksmeta to ensure that boundary validation logic is corrected. In environments where updating may not be feasible instantly, restricting access to raw block devices via strict file system permissions can limit the attack surface. Additionally, implementing rigorous input sanitization protocols in any custom scripts or applications that interact with LUKS metadata slots will help prevent malformed headers from triggering out-of-bounds operations. Security teams should also enforce policies requiring verification of disk image integrity before mounting, utilizing cryptographic hashes to detect tampering prior to processing. Regular audits of administrative access controls and monitoring for unusual block device write activities can further reduce the risk of successful exploitation in production environments.