Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects potential exploitation of CVE-2026-4892 by correlating inbound DHCPv6 traffic (UDP/547) with a dnsmasq process crash (SIGSEGV/SIGABRT exit codes 132, 134, 135, 139) on the same host within a 60-second window. This vulnerability involves sending crafted DHCPv6 messages with oversized Client Identifier options to a dnsmasq server configured with --dhcp-script, leading to a denial of service.
This rule detects potential exploitation of CVE-2026-4892 by correlating inbound DHCPv6 traffic (UDP/547) with a dnsmasq process crash (SIGSEGV/SIGABRT exit codes 132, 134, 135, 139) on the same host within a 60-second window. This vulnerability involves sending crafted DHCPv6 messages with oversized Client Identifier options to a dnsmasq server configured with --dhcp-script, leading to a denial of service.
Detects dnsmasq or its DHCP helper child process terminating abnormally on Linux hosts due to signals like SIGSEGV, SIGABRT, SIGBUS, or SIGILL. This behavior is indicative of a crash, potentially caused by exploitation attempts of vulnerabilities such as CVE-2026-4892, a heap buffer overflow in dnsmasq's helper.c when processing oversized DHCPv6 Client Identifier (CLID) options. This rule fires post-impact, complementing network-side detections.