Bug 2567957 (CVE-2026-92695)

Summary: CVE-2026-92695 fastnetmon: fastnetmon: Denial of Service via out-of-bounds read during packet parsing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FastNetMon. When packet capture is enabled, the packet parser fails to properly validate the length of captured network frames before reading header data. A remote attacker can exploit this flaw by sending specially crafted packets with manipulated header lengths, triggering an out-of-bounds read. This issue can cause process termination, resulting in a Denial of Service (DoS), or potentially lead to unauthorized memory reading.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-11-05 22:41:54 UTC 
FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, the live parse_packet() callback in src/pcap_plugin/pcap_collector.cpp is registered through pcap_loop and processes captured frames when pcap = on without checking packethdr->caplen. A short frame or an attacker-controlled IPv4 header length can make the parser dereference IP or transport headers beyond the captured bytes, causing an out-of-bounds read and process termination. No fixed release is available as of this review.