CVE-2026-15812 in Red Hat
Summary
by MITRE • 07/21/2026
A vulnerability was found in the internal Access Control List (ACL) subsystem of kronosnet (Version affected: <= 1.34). When the framework is explicitly configured to manage dynamic links (accepting network traffic from any IP address) without network payload encryption, the validation architecture implicitly trusts the link ID provided within incoming data packets. A remote, unauthenticated attacker can exploit this lack of validation by spoofing a legitimate link ID inside crafted network frames. This allows the attacker to fully bypass the ACL framework and inject arbitrary data packets into the application layer, potentially leading to data corruption or service instabilities.
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Analysis
by VulDB Data Team • 07/21/2026
The vulnerability resides within the kronosnet framework's internal Access Control List subsystem, specifically affecting versions 1.34 and earlier. This represents a fundamental flaw in the authentication and authorization architecture that operates at the network transport level. The issue becomes particularly critical when the system is configured to manage dynamic links, which inherently relaxes security constraints by accepting traffic from any IP address. This configuration choice creates an attack surface where the framework's trust model becomes dangerously permissive, relying on data integrity that cannot be verified through traditional means.
The core technical flaw manifests in the implicit trust relationship between the network layer and the application layer within kronosnet's architecture. When network payload encryption is disabled, the system's validation mechanisms fail to properly authenticate link identifiers embedded within incoming data packets. This creates a condition where the framework assumes that any link ID present in a packet header is legitimate without performing cryptographic verification or cross-reference validation against established connection parameters. The vulnerability directly maps to CWE-287 Improper Authentication and CWE-345 Insufficient Verification of Data Authenticity, representing a classic case of trust abuse in network security protocols.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential data integrity compromise and service availability threats. A remote attacker can exploit this weakness by crafting malicious network frames containing spoofed link IDs that appear legitimate to the system's validation subsystem. Once successfully bypassing the ACL framework, the attacker gains unrestricted access to inject arbitrary data packets directly into the application layer, effectively circumventing all network-level security controls. This capability enables sophisticated attacks including man-in-the-middle operations, data injection for corruption, and potentially service disruption through malformed packet sequences that can destabilize the application layer processing.
The attack vector demonstrates clear alignment with ATT&CK technique T1071.004 Application Layer Protocol and T1566.001 Phishing via Service. The vulnerability's exploitation requires no authentication credentials, making it particularly dangerous in environments where network monitoring is insufficient or where the dynamic link configuration is deployed without proper security assessment. Mitigation strategies must address both the immediate architectural weakness and broader security posture issues. Organizations should implement mandatory network payload encryption regardless of link configuration, deploy robust packet validation mechanisms that verify link ID authenticity through cryptographic means, and establish strict network segmentation policies to limit exposure. Additionally, the system should incorporate automated monitoring for anomalous link ID patterns and implement rate limiting to prevent rapid exploitation attempts. The vulnerability highlights critical gaps in zero-trust security models where implicit trust relationships can be exploited to bypass entire security frameworks without proper authentication verification mechanisms.