Incorrect packet validation allowed unbounded recursion parsing SCTP chunk parameters. This can eventually result in a stack overflow and panic. Remote attackers can craft packets which cause affected systems to panic. This affects any system where pf is configured to process traffic, independent of the configured ruleset.
Casky was already ahead
This CVE exploits attack patterns that Casky's 0matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.
CVE-2026-7164 exploits a critical flaw in packet validation logic within OpenBSD's pf firewall, where improper handling of SCTP chunk parameters allows unbounded recursion during parsing. This vulnerability is particularly dangerous because it affects any system running pf regardless of ruleset configuration—attackers need only craft malicious SCTP packets to trigger a stack overflow and cause system panic, resulting in denial of service. Organizations relying on pf for network segmentation, DDoS mitigation, or perimeter defense face immediate availability risks, as remote attackers can launch attacks without authentication or special privileges.
While this CVE currently lacks mapped MITRE ATT&CK techniques, Casky's AI-powered analysis would identify attack patterns associated with resource exhaustion and network-based denial of service exploitation. Practitioners using Casky would observe detection patterns tied to CWE-674 (uncontrolled recursion) and CWE-791 (incomplete filtering of special elements), surfacing anomalous packet structures with deeply nested or malformed SCTP parameters. Extended reasoning capabilities would correlate unusual packet processing behavior, system resource spikes, and panic dumps to pinpoint exploitation attempts—enabling security teams to develop detection signatures, refine pf rulesets to validate SCTP integrity, and prioritize patching before active exploitation campaigns emerge.
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